Longtime automotive tooling firm to close Detroit area plant, lay off 130 workers

proper tooling_Warren_costar_i.jpg — Proper Tooling plans to close its manufacturing plant at 13870 E. 11 Mile Road in Warren, MIch., by March 31. (CoStar Group Inc.)

By:

Crain's Detroit Business

January 14, 2023 11:52 AM

Proper Group Holdings LLC is planning to close its plastic tooling and molding plant near Detroit and lay off 130 workers due to financial hardship and a private equity takeover that went sideways.

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