EXHIBIT A JOINT FILING AGREEMENT

Exhibit 99.a

EXHIBIT A

JOINT FILING AGREEMENT

Pursuant to Rule 13d-1(k)(1)(iii), we the undersigned agree that the Schedule 13D, to which this Joint Filing Agreement is attached as Exhibit A, is filed on behalf of each of us.

Dated:  February 19, 2010

HEARTLAND INDUSTRIAL ASSOCIATES L.L.C.

By:	/s/ Xxxxxx X. Xxxxxxxx
	Name: Xxxxxx X. Xxxxxxxx
	Title: Managing Member

HEARTLAND INDUSTRIAL PARTNERS, L.P.

By:  Heartland Industrial Associates L.L.C., its General Partner

By:	/s/ Xxxxxx X. Xxxxxxxx
	Name: Xxxxxx X. Xxxxxxxx
	Title: Managing Member

TRIMAS INVESTMENT FUND I, L.L.C.

By:  Heartland Industrial Associates L.L.C., the General Partner of Heartland Industrial Partners, L.P., its Managing Member

By:	/s/ Xxxxxx X. Xxxxxxxx
	Name: Xxxxxx X. Xxxxxxxx
	Title: Managing Member

METALDYNE INVESTMENT FUND I, L.L.C.

By:  Heartland Industrial Associates L.L.C., the General Partner of Heartland Industrial Partners, L.P., its Managing Member

By:	/s/ Xxxxxx X. Xxxxxxxx
	Name: Xxxxxx X. Xxxxxxxx
	Title: Managing Member

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HIP SIDE-BY-SIDE PARTNERS, L.P.

By:  Heartland Industrial Associates L.L.C., its General Partner

By:	/s/ Xxxxxx X. Xxxxxxxx
	Name: Xxxxxx X. Xxxxxxxx
	Title: Managing Member

TRIMAS INVESTMENT FUND II, L.L.C.

By:  Heartland Industrial Associates L.L.C., its Managing Member

By:	/s/ Xxxxxx X. Xxxxxxxx
	Name: Xxxxxx X. Xxxxxxxx
	Title: Managing Member

METALDYNE INVESTMENT FUND II, L.L.C.

By:  Heartland Industrial Associates L.L.C., its Managing Member

By:	/s/ Xxxxxx X. Xxxxxxxx
	Name: Xxxxxx X. Xxxxxxxx
	Title: Managing Member

HIP SIDE-BY-SIDE I-A, L.L.C.

By:  Heartland Industrial Associates L.L.C., its Managing Member

By:	/s/ Xxxxxx X. Xxxxxxxx
	Name: Xxxxxx X. Xxxxxxxx
	Title: Managing Member

HIP INVESTMENT HOLDINGS I, LLC

By:  Heartland Industrial Associates L.L.C., the General Partner of Heartland Industrial Partners, L.P., its Member

By:	/s/ Xxxxxx X. Xxxxxxxx
	Name: Xxxxxx X. Xxxxxxxx
	Title:   Managing Member

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