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