This set of six steel clutch plates fit pre unit and unit Triumph and BSA motorcycles, 500 / 650 / 750 c.c. This is a full set of steel plates, you also need a set of six fiber plates to complete your clutch now that you burned it up doing tough-guy burnouts. A good set of clutch plates is really important to transfer the power your engine is creating efficiently to the rear wheel. Good quality clutch plates save a lot of hassle and keep your knees in the breeze! Replacement for OEM # 57-1363.