CNC Machined Part, Bolts, Screws manufacturer / supplier in China, offering DIN 653, Steel Flat Cylindrical/Cap Head Hand Knurled Thumb Screws/Captive Screws, Ss Straight Knurled Head Thumb Knobs Captive Screws, Stainless Steel Torx Socket Head Knurling Thumb Screws/Captive Screw and so on.