<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1998             DEC-31-1998
<PERIOD-END>                               MAR-31-1998             JUN-30-1998             SEP-30-1998
<CASH>                                         136,217                 196,829                 158,841
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                               26,828,781              25,954,659              24,996,717
<ALLOWANCES>                                   430,000                 430,000                 480,000
<INVENTORY>                                 32,871,072              30,128,247              28,605,095
<CURRENT-ASSETS>                            61,105,446              57,224,776              54,896,643
<PP&E>                                      47,791,974              49,003,504              50,245,561
<DEPRECIATION>                              17,037,526              17,691,739              18,380,847
<TOTAL-ASSETS>                              94,570,898              91,180,299              89,337,868
<CURRENT-LIABILITIES>                       23,328,825              18,543,605              18,738,682
<BONDS>                                     23,406,122              21,294,241              17,557,769
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                     1,043,423               1,100,999               1,101,000
<OTHER-SE>                                           0                       0                       0
<TOTAL-LIABILITY-AND-EQUITY>                94,570,898              91,180,299              89,337,868
<SALES>                                     55,493,345             116,815,537             168,221,575
<TOTAL-REVENUES>                            55,493,345             116,815,537             168,221,575
<CGS>                                       46,120,374              95,726,007             138,891,672
<TOTAL-COSTS>                               46,120,374              95,726,007             138,891,672
<OTHER-EXPENSES>                             4,946,225              10,235,308              15,142,831
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                             417,013                 906,439               1,304,205
<INCOME-PRETAX>                              4,009,733               9,947,783              12,882,867
<INCOME-TAX>                                 1,622,000               4,069,000               5,291,000
<INCOME-CONTINUING>                          2,387,733               5,878,783               7,591,867
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                 2,387,733               5,878,783               7,591,867
<EPS-PRIMARY>                                     0.21                    0.51                    0.66
<EPS-DILUTED>                                     0.21                    0.50                    0.66
        

</TABLE>