**Exhibit 21.1**

**METALDYNECORPORATION—SUBSIDIARIES**

(Updatedon May 16, 2006)

| **Name**                                            | ** ** | ** **     | ** ** | **Jurisdiction of   Incorporation** |
|-----------------------------------------------------|------------|----------------|------------|-------------------------------------|
| MascoTech Saturn Holdings Inc.                      |       | Delaware       |
| GLO Srl. (99%)                                      |       | Italy          |
| Metaldyne Company LLC                               |       | Delaware       |
| GMTI Holding Company                                |       | Delaware       |
| Metaldyne Light Metals Company, Inc.           |       | Delaware       |
| Metaldyne DuPage Die Casting Corporation       |       | Illinois       |
| Metaldyne Lester Precision Die Casting, Inc.   |       | Delaware       |
| Halyard Aviation Services, Inc.                |       | Michigan       |
| Metaldyne Asia, Inc.                           |       | Delaware       |
| Metaldyne Hong Kong Limited                         |       | Hong Kong      |
| Metaldyne Mauritius Limited                         |       | Mauritius      |
| Metaldyne (Suzhou) Automotive Components Co., Ltd.  |       | China          |
| Metaldyne Driveline Co., LLC                        |       | Delaware       |
| Metaldyne Engine Co., LLC                           |       | Delaware       |
| Metaldyne Europe, Inc.                         |       | Delaware       |
| Metaldyne Chassis Manufacturing (Hangzhou) Co. Ltd. |       | China          |
| Metaldyne Engine Holdings S.L.                      |       | Spain          |
| Metaldyne Engine España S.L.                   |       | Spain          |
| Metaldyne Sintered Components España S.L.      |       | Spain          |
| Metaldyne International Spain SL                    |       | Spain          |
| Metaldyne Grundstucks GbR (5.1%)                    |       | Germany        |
| MetaldyneLux S.a.r.l. (99.90%)                      |       | Luxembourg     |
| MetaldyneLux Holding S.a.r.l.                       |       | Luxembourg     |
| Metaldyne Europe S.a.r.l.                           |       | Luxembourg     |
| Holzer Limited                                      |       | United Kingdom |
| Metaldyne GmbH                                      |       | Germany        |
| GLO Srl (1%)                                        |       | Italy          |
| Metaldyne Grundstucks GbR (94.9%)                   |       | Germany        |
| Metaldyne International (UK) Ltd.                   |       | United Kingdom |
| Metaldyne International Deutschland GmbH            |       | Germany        |
| Metaldyne International France SAS                  |       | France         |
| Metaldyne Nürnberg GmbH                        |       | Germany        |
| Metaldyne Oslavany, spol. s.r.o.                    |       | Czech Republic |
| Metaldyne Zell GmbH & Co. KG (98%)         |       | Germany        |
| Metaldyne Zell Verwaltungs GmbH                     |       | Germany        |
| Metaldyne Zell GmbH & Co. KG (2%)          |       | Germany        |
| Metaldyne International Sales, Inc.            |       | Barbados       |
| Metaldyne Korea Limited                             |       | Korea          |

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*       Directly owned subsidiaries appear at the left hand margin, first tier and second tier subsidiaries are indicated by single and double indentation, respectively, and are listed under the names of their respective parent companies. Unless otherwise indicated, all subsidiaries are wholly owned. Certain companies may also use trade names or other assumed names in the conduct of their business.

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| Metaldyne Machining and Assembly Company, Inc.         |   | Michigan     |
|-------------------------------------------------------------|--------|--------------|
| Simpson Industries, Ltda                                    |   | Brazil       |
| Metaldyne Mexico, S.A. de C.V.                              |   | Mexico       |
| Metaldyne Machining and Assembly Mfg. Co. (Canada),  Ltd.   |   | Canada       |
| R.J. Simpson India Private Limited (51%)                    |   | India        |
| Simpson Sabind Industries Limited (51%)                     |   | India        |
| Metaldyne U.S. Holding Co.                                  |   | Michigan     |
| Metaldyne International Holdings, B.V.                      |   | Netherlands  |
| Metaldyne Sintered Components of Indiana, Inc.         |   | Delaware     |
| Metaldyne Sintered Components, LLC                          |   | Delaware     |
| Metaldyne Sintered Components Mexico, S. de R.L. de  C.V.   |   | Mexico       |
| Metaldyne Sintered Components Holdings, S. de R.L.  de C.V. |   | Mexico       |
| Metaldyne Sintered Components Services, S. de R.L.  de C.V. |   | Mexico       |
| Metaldyne Tubular Products, Inc.                       |   | Michigan     |
| MRFC, Inc.                                             |   | Delaware     |
| NC-M Chassis Systems, LLC                                   |   | Delaware     |
| Punchcraft Company                                          |   | Michigan     |
| TriMas Corporation (24%)                                    |   | Delaware     |
| Windfall Products, Inc.                                |   | Pennsylvania |
| Metaldyne Componentes Automotivos do Brasil Ltda            |   | Brazil       |
| Windfall Specialty Powders, Inc.                       |   | Pennsylvania |

 

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*       Directly owned subsidiaries appear at the left hand margin, first tier and second tier subsidiaries are indicated by single and double indentation, respectively, and are listed under the names of their respective parent companies. Unless otherwise indicated, all subsidiaries are wholly owned. Certain companies may also use trade names or other assumed names in the conduct of their business.

2

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