Document:

<PAGE>

                                                                    Exhibit 4.21

                                                    [LOGO OF STANDARD CHARTERED]

Date:    27th May 2002
Our ref: C&I/LC/TEAM1/BIH

CONFIDENTIAL

Wing Shing Products (BVI) Co. Ltd.
10/F., Kin Teck Industrial Building
26 Wong Chuk Hang Road
Wong Chuk Hang
Aberdeen Hong Kong

Attn.: Mr. John Sham/Mr. Samuel Leung

Dear Sirs,

             BANKING FACILITIES: WING SHING PRODUCTS (BVI) CO. LTD.

We are pleased to confirm that the Bank is willing to make available to your
company (the "Company") the following working capital facilities up to the
amounts indicated.

1.   TRADE FINANCE GROUP 1 - HKD10,000,000.-

2.   TRADE FINANCE GROUP 2 - HKD8,000,000.-

3.   TRADE FINANCE GROUP 3 - HKD6,000,000.-

The above Trade Finance Groups 1, 2 and 3 are complementary and the combined
outstandings are not to exceed HKD10,000,000.- Similarly the combined
outstandings of Trade Finance Groups 2 and 3 are not to exceed HKD8,000,000.-.
For product availability, please see the attachment to this letter.

Prior evidence of insurance is required for all "free on board" and "cost and
freight" shipments under import letters of credit.

Combined usance and loan period of any one transaction under import facilities
is not to exceed 120 days.

Usance period of export facilities is not to exceed 90 days.

Standard Chartered Bank
Corporate & Institutional Banking
Credit Operations

11th Floor Standard Chartered Tower
388 Kwun Tong Road Kwun Tong Hong Kong

Incorporated in England with limited liability by Royal Charter 1853
The Principal Office of the Company is situated in England at 1 Aldermanbury
Square London EC2V 7SB Reference Number ZC 18

<PAGE>

Wing Shing Products (BVI) Co. Ltd.                                        Page 2

Acceptance of import loans not under letters of credit is permitted up to
HKD6,000,000.- against the production of commercial invoices from non-group
suppliers but remittance of loan proceeds to suppliers must be handled by the
Bank.

Packing credits are allowed with 70% advance on the export letters of credit for
up to 90 days or until expiry of the related letters of credit, whichever is
earlier.

The Company undertakes not to accept any amendments to the master letters of
credit without the prior written consent of the Bank.

In addition to the above working capital facilities, the following financing
facility is available.

4.   FIXED LOAN FACILITY - HKD2,006,050.43

Outstanding loan for financing up to 80% of the total purchase amount of plastic
injection moulding machinery, die casting machinery and related miscellaneous
machinery. Interest will be payable monthly in arrears at Prime plus 1% per
annum or HIBOR plus 1% per annum if the loan outstanding is totally secured by
charge over cash or cash equivalents. The loan will be repayable by 10 monthly
instalments of HKD182,366.- each commencing 30th May 2002 and a final instalment
of HKD182,390.43, subject always to the Bank's right to receive repayment on
demand. Prepayment will be allowed, provided that the Company gives us at least
two full business days' prior notice and the amount prepaid is at least 5% of
the initial loan. Any amounts prepaid will reduce the repayment instalments in
inverse order of maturity and may not be redrawn.

INTEREST, COMMISSIONS AND FEES

A default rate of 8% per annum over Prime will apply to amounts not paid when
due or in excess of agreed facility amounts. "Prime" means the rate which we
announce or apply from time to time as our prime rate for lending Hong Kong
Dollars and "HIBOR" means the rate which we determine to be the Hong Kong
Interbank Offered Rate for the relevant period. Commissions will be charged at
our standard rates unless otherwise stipulated. Export bills will be discounted
and import bills will be financed at our standard bills finance rates plus 0.25%
per annum. All past due bills shall bear interest at 4% per annum above the
rates charged on your regular bills outstandings.

Letters of Credit Opening Commission
------------------------------------
First USD50,000.-  1/4%
Balance           1/16%

<PAGE>

Wing Shing Products (BVI) Co. Ltd.                                        Page 3

Whether or not the documentation for the above facilities is executed or the
facilities are made available to you as contemplated following your acceptance
of this letter, you shall forthwith on demand reimburse the Bank all out of
pocket expenses (including but not limited to legal fees and disbursements)
incurred by the Bank in connection with the facilities including, without
limitation, the negotiation, preparation, execution and/or enforcement of this
letter and the documentation referred to below.

AVAILABILITY AND REPAYMENT

The above facilities are subject to periodic review by the Bank at its
discretion, and it is expressly agreed that they will at all times be available
at the sole discretion of the Bank. Notwithstanding any other provisions
contained in this letter or in any other document, the Bank will at all times
have the right to require immediate payment and/or cash collateralisation of all
or part of any sums actually or contingently owing to it, and the right to
immediately terminate or suspend, in whole or in part, the facilities and all
further utilisation of the facilities.

ASSIGNMENT

The Company may not assign or transfer all or any of its rights, benefits or
obligations under this letter (and any documentation or transactions to which
this letter relates) without the Bank's prior written consent.

The Bank may at any time assign or transfer to any one or more banks or other
financial institutions all or any of its rights, benefits or obligations under
this letter (and any documentation or transactions to which this letter relates)
or change its lending office.

DOCUMENTATION

Before the above facilities may be used, the enclosed copy of this letter must
be signed by the Company and returned to us together with a certified copy of
appropriate authorising board resolutions.

The following documentation are held/will also be required:

..    General Customer Agreement executed by the Company.

<PAGE>

Wing Shing Products (BVI) Co. Ltd.                                        Page 4

..    All monies charge over deposits &/or all monies charge over securities to
     cover any cash equivalent securities held by the Company and/or Global-Tech
     Appliances Inc. with the Bank for the account of the Company in an amount
     of not less than the outstanding amount of the fixed loan facility should
     the Company elect to take the HIBOR plus 1% per annum pricing option.

     Advance Ratio
     a)   100% for cash deposits in HKD or USD (including the Bank's Certificate
          of Deposit).
          90% for cash deposit in other major foreign currencies.
     b)   80% for fixed income securities bearing credit rating of no less than
          investment grade sold through the Bank's Global Markets.
     The Bank reserves the right to require a higher margin.

..    Unlimited corporate guarantee by Global-Tech Appliances Inc. for the
     Company.

..    Letter of undertaking by Global-Tech Appliances Inc. covenanting:-

     (i)  not to pledge, mortgage or charge any of its assets in Hong Kong or in
          China to any party, nor will it issue any guarantee/indemnity,
          directly or indirectly, in support of any banking facility, borrowing
          or financial assistance given or to be given by any bank or financial
          institution to any party, outside British Virgin Islands, Hong Kong or
          China without first obtaining the prior written consent of the Bank.

     (ii) to assure the security position of the Bank shall rank at least
          pari-passu with all other bankers of the Group in extending similar
          facilities.

..    Signed original copies of audited financial statements of the Company and
     Global-Tech Appliances Inc. within 9 months after their financial year end.
     A signed original copy of quarterly management accounts of Global-Tech
     Appliances Inc. within 75 days after the date of the financial statements.
     Such other information as the Bank may request from time to time.

UNDERTAKING

The Company undertakes to the Bank that it will:

..    Assure the security position of the Bank shall rank at least pari-passu
     with all other bankers of the Group in extending similar facilities.

<PAGE>

Wing Shing Products (BVI) Co. Ltd.                                        Page 5

..    Not pledge, mortgage or charge any of its assets in Hong Kong or in China
     to any party, nor will it issue any guarantee/indemnity, directly or
     indirectly, in support of any banking facility, borrowing or financial
     assistance given or to be given by any bank or financial institution to any
     party, outside British Virgin Islands, Hong Kong or China without first
     obtaining the prior written consent of the Bank.

..    Immediately inform the Bank of any change of the Company's directors or
     beneficial shareholders or amendment of its memorandum or articles of
     association.

By acceptance of this letter the Company gives consent to the Bank to disclose
details of the Company's account relationship with the Bank (including credit
balances and any security given for the facilities) to all or any of the
following persons (whether in or outside Hong Kong): (i) its Head Office and any
of its offices, branches, related companies or associates, (ii) any actual or
proposed participant or sub-participant in, or assignee or novatee of the Bank's
rights in relation to the Company's accounts, (iii) any agent, contractor or
third party service provider which provides services of any kind to the Bank in
connection with the operation of its business, (iv) any financial institution
with which the Company has or proposes to have dealings to enable credit checks
to be conducted on the Company, and (v) any person to whom the Bank is under an
obligation to make disclosure under the requirements of any law binding on the
Bank or any of its branches.

Please sign the enclosed copy of this letter and return it to the Bank's Credit
Operations at 11th Floor, Standard Chartered Tower, 388 Kwun Tong Road, Kwun
Tong, Kowloon for the attention of Ms. Phyllis Fong, within one month after the
date of this letter. This letter will supersede any previous facility letter
which the Bank has issued to the Company. This letter will be governed by Hong
Kong SAR law.

We enclose a set of documents which should also be completed and returned to the
Bank at the above mentioned address. If you have any queries regarding the
completion of the required documents, please contact Ms. Phyllis Fong, whose
telephone number is 2282-6265. With regard to queries on banking arrangements,
you can contact your Senior Relationship Manager Mr. Andy M. K. Ho, whose
telephone number is 2821-1897.

<PAGE>

Wing Shing Products (BVI) Co. Ltd.                                        Page 6

We are pleased to be of service to you and take this opportunity to thank you
for your custom.

Yours faithfully,
For and on behalf of STANDARD CHARTERED BANK

/s/ Betty Leung
-----------------------------------
Betty Leung
Senior Credit Documentation Manager

BL/PFG/bn
Encl.

Agreed.
For and on behalf of WING SHING PRODUCTS (BVI) CO. LTD.

/s/ John C. K. Sham
-----------------------------------
    John C. K. Sham

<PAGE>

                       WING SHING PRODUCTS (BVI) CO. LTD.

ATTACHMENT REGARDING TRADE FINANCE PRODUCTS

This attachment forms an integral part of our banking facility letter dated 27th
May 2002.

You may use any product or aggregate of products in any one group up to the
limit shown in the attached banking facility letter.

Trade Finance Group 1

..    Discrepant Credit Bills Negotiated - with recourse
..    Purchase of Documents Against Payment Bills of Exchange secured by goods
..    Purchase of Documents Against Acceptance Bills of Exchange with
     ECA/approved insurance cover
..    Back to Back Letters of Credit
..    Import Letters of Credit - sight and usance
                              - secured by goods
..    Loan Against Import

Trade Finance Group 2

..    Purchase of Documents Against Acceptance Bills of Exchange without
     ECA/approved insurance cover
..    Purchase of Documents Against Payment Bills of Exchange not secured by
     goods
..    Quasi Back to Back Letters of Credit - not secured by goods
..    Import Letters of Credit - sight and usance
                              - not secured by goods
..    Shipping Guarantees

Trade Finance Group 3

..    Pre-shipment Loan - i.e. Packing Credit
..    Acceptance of draft under Import Letter of Credit
..    Release of Documents Against Acceptance or Trust Receipt
..    Loans Against Trust Receipt
..    Import Loans<PAGE>

                                                                    Exhibit 4.22

                                                    [LOGO OF STANDARD CHARTERED]

Date:    27th May 2002
Our ref: C&I/LC/TEAM1/BIH

CONFIDENTIAL

Kwong Lee Shun Trading Co. Ltd.
10/F., Kin Teck Industrial Building
26 Wong Chuk Hang Road
Aberdeen, Hong Kong

Attn.: Mr. John Sham/Mr. Samuel Leung

Dear Sirs,

               BANKING FACILITIES: KWONG LEE SHUN TRADING CO. LTD.

We are pleased to confirm that the Bank is willing to make available to your
company (the "Company") the following working capital facilities up to the
amounts indicated.

1.   CURRENT ACCOUNT OVERDRAFT - HKD2,000,000.-

2.   CAPITAL GOODS LETTERS OF CREDIT (I) - HKD20,000,000.-

For the issuance of documentary letters of credit secured by the underlying
goods to finance 80% of purchase of plastic injection moulding machinery,
die-casting machinery and related miscellaneous machinery.

3.   IMPORT LOANS/LOANS AGAINST TRUST RECEIPT - HKD20,000,000.-

For import loans and loans against trust receipt of up to 90 days to meet
drawings under irrevocable letters of credit secured or unsecured by goods
opened by the Bank. Prior evidence of insurance will be required for all "free
on board" and "cost and freight" shipments.

4.   CAPITAL GOODS LETTERS OF CREDIT (II) - EUR760,342.-

For the issuance of documentary letters of credit, secured by the underlying
goods, for the purchase of a leisure boat.

Standard Chartered Bank
Corporate & Institutional Banking
Credit Operations

11th Floor Standard Chartered Tower
388 Kwun Tong Road Kwun Tong Hong Kong

Incorporated in England with limited liability by Royal Charter 1853
The Principal Office of the Company is situated in England at 1 Aldermanbury
Square London EC2V 7SB Reference Number ZC 18

<PAGE>

Kwong Lee Shun Trading Co. Ltd.                                           Page 2

In addition to the above working capital facilities, the following financing
facility is available.

5.   FIXED LOAN FACILITY - EUR760,342.-

To be used for financing the leisure boat purchased under Facility 4. This
facility is allowed to be switched into USD or HKD at the Company's discretion.
Interest will be payable monthly in arrears at LIBOR plus 0.5% per annum. The
loan will be repayable by 11 quarterly instalments of EUR69,122.- each,
commencing three months after drawdown, subject always to the Bank's right to
receive repayment on demand. Prepayment will be allowed, provided that the
Company gives us at least two full business days' prior notice and the amount
prepaid is at least 5% of the initial loan. Any amounts prepaid will reduce the
repayment instalments in inverse order of maturity.

Notes:
i)   The total amount outstanding on the above facilities 2 and 3 is not to
     exceed HKD20,000,000.-
ii)  The total amount outstanding on the above facilities 4 and 5 is not to
     exceed EUR760,342.-

INTEREST, COMMISSIONS AND FEES

Unless otherwise specified, interest on all sums advanced will be payable
monthly in arrears at 1% per annum over Prime or HIBOR, whichever is higher. A
default rate of 8% per annum over Prime or HIBOR, whichever is higher, will
apply to amounts not paid when due or in excess of agreed facilities amounts.
"Prime" means the rate which we announce or apply from time to time as our prime
rate for lending Hong Kong Dollars, "LIBOR" means the rate which we determine to
be the London Interbank Offered Rate for the relevant period and "HIBOR" means
the rate which we determine to be the Hong Kong Interbank Offered Rate for the
relevant period. Commissions will be charged at our standard rates unless
otherwise stipulated. Export bills will be discounted and import bills will be
financed at our standard bills finance rates plus 0.25% per annum. All past due
bills shall bear interest at 4% per annum above the rates charged on your
regular bills outstandings.

Commission on Letters of Credit Opening
---------------------------------------
First USD50,000.-        1/4%
Balance                 1/16%

Whether or not the documentation for the above facilities is executed or the
facilities are made available to you as contemplated following your acceptance
of this letter, you shall forthwith on demand reimburse the Bank all out of
pocket expenses (including but not limited to legal fees and disbursements)
incurred by the Bank in connection with the facilities including, without
limitation, the negotiation, preparation, execution and/or enforcement of this
letter and the documentation referred to below.

<PAGE>

Kwong Lee Shun Trading Co. Ltd.                                           Page 3

AVAILABILITY AND REPAYMENT

The above facilities are subject to periodic review by the Bank at its
discretion, and it is expressly agreed that they will at all times be available
at the sole discretion of the Bank. Notwithstanding any other provisions
contained in this letter or in any other document, the Bank will at all times
have the right to require immediate payment and/or cash collateralisation of all
or part of any sums actually or contingently owing to it, and the right to
immediately terminate or suspend, in whole or in part, the facilities and all
further utilisation of the facilities.

ASSIGNMENT

The Company may not assign or transfer all or any of its rights, benefits or
obligations under this letter (and any documentation or transactions to which
this letter relates) without the Bank's prior written consent.

The Bank may at any time assign or transfer to any one or more banks or other
financial institutions all or any of its rights, benefits or obligations under
this letter (and any documentation or transactions to which this letter relates)
or change its lending office.

DOCUMENTATION

Before the above facilities may be used, the enclosed copy of this letter must
be signed by the Company and returned to us together with a certified copy of
appropriate authorising board resolutions.

The following documentation are held/will also be required:

..    General Customer Agreement executed by the Company.

..    All monies charge over deposits held by the Company with the Bank in an
     amount of not less than EUR760,342.-
     (10% extra margin required for other major foreign currency deposits. The
     Bank reserves the right to require a higher margin.)

..    Unlimited corporate guarantee by Global-Tech Appliances Inc.

..    Certified true copies of the certificate of incorporation and memorandum
     and articles of association of Global-Tech Appliances Inc.

<PAGE>

Kwong Lee Shun Trading Co. Ltd.                                           Page 4

..    Signed original copies of audited financial statements of the Company and
     Global-Tech Appliances Inc. within 9 months after their financial year end.
     A signed original copy of quarterly management accounts of Global-Tech
     Appliances Inc. within 75 days after the date of the financial statements.
     Such other information as the Bank may request from time to time.

UNDERTAKING

The Company undertakes to the Bank that it will:

..    Immediately inform the Bank of any change of the Company's directors or
     beneficial shareholders or amendment of its memorandum or articles of
     association.

By acceptance of this letter the Company gives consent to the Bank to disclose
details of the Company's account relationship with the Bank (including credit
balances and any security given for the facilities) to all or any of the
following persons (whether in or outside Hong Kong): (i) its Head Office and any
of its offices, branches, related companies or associates, (ii) any actual or
proposed participant or sub-participant in, or assignee or novatee of the Bank's
rights in relation to the Company's accounts, (iii) any agent, contractor or
third party service provider which provides services of any kind to the Bank in
connection with the operation of its business, (iv) any financial institution
with which the Company has or proposes to have dealings to enable credit checks
to be conducted on the Company, and (v) any person to whom the Bank is under an
obligation to make disclosure under the requirements of any law binding on the
Bank or any of its branches.

Please sign the enclosed copy of this letter and return it to the Bank's Credit
Operations at 11th Floor, Standard Chartered Tower, 388 Kwun Tong Road, Kwun
Tong, Kowloon for the attention of Ms. Phyllis Fong, within one month after the
date of this letter, after which this offer will lapse. When accepted, this
letter will supersede any previous facility letter which the Bank has issued to
the Company. This letter will be governed by Hong Kong SAR law.

We enclose a set of documents which should also be completed and returned to the
Bank at the above mentioned address. If you have any queries regarding the
completion of the required documents, please contact Ms. Phyllis Fong, whose
telephone number is 2282-6265. With regard to queries on banking arrangements,
you can contact your Senior Relationship Manager Mr. Andy M. K. Ho, whose
telephone number is 2821-1897.

<PAGE>

Kwong Lee Shun Trading Co. Ltd.                                           Page 5

We are pleased to be of service to you and take this opportunity to thank you
for your custom.

Yours faithfully,
For and on behalf of STANDARD CHARTERED BANK

/s/ Betty Leung
-----------------------------------
Betty Leung
Senior Credit Documentation Manager

BL/CKM/bn
Encl.

Agreed.
For and on behalf of KWONG LEE SHUN TRADING CO. LTD.

/s/ John Sham
-----------------------------------
    John Sham

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