Safe for all types of TCM starter adapters! Feature Sky-Tec’s exclusive proprietary clutch design virtually eliminating starterinduced TCM starter adapter wear. FAAPMA certified replacement part approved for all TCM starter adapters including “classic Style”, “improved style”, “permold”, and “sand cast” engines. Simple bolt-off / bolt-on installation. Designed to crank no slower than TCM heavyweight OEM starters. Generous 2-Year factory warranty.