Masonry Anchor, Tapping Screw, Driling Screw manufacturer / supplier in China, offering Hex Lock Nut High Quality Factory Price DIN985 Carbon/Stainless Steel, Stainless-Steel Hexagonal Hex Nylon Insert Lock Nut, Self Locking Nylock Nut, Hex Head Nuts Prevailing Torque Type Hexagon Thin Nuts with Non-Metallic Insert and so on.