sprocket 1,25b-120b all type 2,high precision cnc tech 3,black oxide anti-corrosion 4,large ... C45, stainless steel and customer requirement. and with the processing of high frequency quenching. 4, we also provide nonstandard( ... , galvanization, chroming, electrophoresis, color painting, or customer requirementPerformanceHigh precision, high wear resistance, low noise, smooth and steady, high ...