Smooth 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 color: grey, black 4)Machine: cold forging machine2.Design / Structure / Details PicsBolt drawing:Products show:3.Advantages / Features:1). Materials:Our company has purchased steel from several large ...