... : C45,20CrMnTi,40Cr,42CrMo,stainless We supply: Electric Bicycle Sprocket 1) Standard stock and finished bore sprockets/plate wheels according ... as C45, 20CrMnTi, 40Cr, 42CrMo or stainless steel or copper or nylon and so on Process:Cutting, hobbing, lathe ... gear1.Sprocket, stainless Sprocket, platewheel, taper bore sprocket, standard and non-standard sprockets, etc2.Material: C45, A3...According to ISO, ...