... , Broaching, 3.Material: C45,20CrMnTi,40Cr,42CrMo,stainless We supply: Electric Bicycle Sprocket 1) Standard stock and finished bore sprockets/plate wheels ... , A3...According to ISO, DIN, ANSI, JIS, BS standard 3.Chain sprocket, taper bore sprocket, standard sprocket, idler sprocket, stainless steel ...