... 9,12.9 3)Finish color: grey, black 4)Machine: cold forging machine2.Design / Structure / Details PicsBolt drawing:Products ... final packing. We have Magnetic Powder Detector, Material Testing Machine, Metallographic Microscope, such testing instruments, guarantee product high ... million bolts. Now we buy a Full Automatic Cool-forging Machine. this greatly enhances our production capacity with more ...