EXHIBIT A JOINT FILING AGREEMENT

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:  December 1, 2009
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

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