Pulley Clutch Stainless steel garter spring, Bore: 5/8 ", No adjustment required, Sintered metal shoes, 4 1/4" outside diameter, Weldless construction, Non-directional(inboard or outboard), A or B belt, 3 1/4" pulley diameter, Each clutch includes an instruction sheet explaining proper installation methods and maintenance, Keyway: 3/16 ", Keyway: Grooved, Oilite bearings. Fits Models: Replaces Part Numbers: Stens Part Number: 255-307