Machining Parts, Hardwares, Screws manufacturer / supplier in China, offering Non-Standard Hollow Vacuum Vented Screw with Hole, Hex Head, Through-Hole Bolt, Custom Aluminum Round Spacers-M3X6 Length 18mm, Plain Finish, Machined Hardware Standoffs, Ring with The Threaded Hole, AISI 303/304 Ring, Sealing Ring, Adjusting Ring and so on.