... surface, and high production efficiency. 1)raw material:40CR,35CRMO 2)Grade:10.9,12.9 3 ... Finish color: grey, black 1. Products Information1)raw material:40CR,35CRMO 2)Grade:10.9,12.9 3)Finish ... and to final packing. We have Magnetic Powder Detector, Material Testing Machine, Metallographic Microscope, such testing instruments, guarantee product ... Sell 40Cr 12.9 grade Cold Forging Track Shoes Bolt & Nut