Aluminum

CDHPOWER 36T/40T/44T/52T Sprocket Fully CNC Made:100% Fully cnc made; For 2 stroke kit and 4 stroke kit; for spoke wheel onlyDiameter of Center hole: 57mm ; Thickness: 6.5mmUsed with 12G and 14G spokes; Only for spoke wheels; Durable aluminum unit.Compatible with the 415 Heavy Duty ChainOutdiameter 36T sprocket: 152mmOutdiameter 40T sprocket: 168.7mmOutdiameter 44T sprocket: 185.5mmOutdiameter 52T sprocket: 220mm Rear Hub Adapter 1.5 inchThe Adapter fits 1.5 inch rear hub of SPOKE WHEEL BIKE with a diameter of 1.52-1.528" (FOR SPOKE WHEEL BIKE ONLY)Does not works with 9 hole and 6 hole sprocket, Only fit spoke wheel bicycle;2pcs screw 12.9 Grade/W3/8-16X1" , 3pcs screw 10.9 Grade/W5/16-18X1";Adapter is a durable aluminum unit fully cnc machine made that provides fast and easy installation;Worked well on gas motor kit 48cc/50cc/66cc/80cc gas motorized bicycle;please note: The bigger three allen bolts diameter is 10mm; It is 1.5 inch adapter , fit on well on 1.52 inch-1.528 inch rear hub of SPOKE WHEEL BIKE(FOR SPOKE WHEEL BIKE ONLY)NOT FIT ON 1 inch rear hub of spoke wheel; NOT work with stock rear sprocket of engine kit unless you drill three holes on stock sprocket.2pcs screw 12.9Grade/W3/8-16X1" 3pcs screw 10.9Grade/W5/16-18X1"Adapter is a durable aluminum unit fully cnc machine made that provides fast and easy installation.Worked well on gas motor kit 48cc/50cc/66cc/80cc gas motorized bicycleThis 1.5 inch adapter works well with dolphin1986 multifunctional 32T/36T sprocket; and also compatible with the cnc fully made 44 teeth sprocket, pls refer to the last two pictures; also works well on other rear sprockets if you are professinal on how to make it.