... Ring Gage, Athread Gage.1)high quality, and reasonable price,the color and size can do as customers' requestswe can do ... tester,hardness tester, concentricity tester etc4) Parts are produced according to customers' drawing or sample5)Main equipment: CNC lathe, automatic lathe ... are convinced that your choice will be your fortune in the future. Supply the hexagon screw with inside and outside thread