... , Broaching, 3.Material: C45,20CrMnTi,40Cr,42CrMo,stainless We supply: Electric Bicycle Sprocket 1) Standard stock and finished bore sprockets/plate wheels ... European, American and JIS standards2) Taper bore sprockets3) Sprockets with QD bushes4) Idler sprockets 5) Double single sprockets and extended pitch ...