IATCO BK-313-500-IAT 2" Hinged Clutch Brake (.500" Thick) Replaces bk-313-500 Prevent the need to drop the transmission by installing a hinged clutch brake Includes lock screw, Allen head wrench and pins to clasp brake over input shaft .500" Thick Used when distance from the engine housing to the flywheel surface is between 2.660" & 2.725"