sprocket:Not OEM,no standards,do as the client's drawing This sprockets: Not OEM,No standards,do as the client's drawingThe details is the following:1,Material: GB20CrMnTi2,NO. of teeth:63,Moudle:34,Roll pitch:22.05,Pitch:38.16,Hardness:HRC50-55HRCwelcom ur inquiry sprocket