Bullet Lines 1" Bore 40 Series Torque Converter Driver  Fits 8-18 hp engines  Replaces Comet 40D or 40/44 Series Pulley 203015  For Go Kart and Golf Cart Belt Drives - BSL-56 Replaces Comet 40D or 40/44 Driver Pulleys Fits 1 inch Engine Shaft Worlks with 8 - 18 HP engines Requires 7/8 inch Width Symmetrical Belt Great for Go Karts and Golf Carts