Fasteners, Bolt, Screws manufacturer / supplier in China, offering 1/4" X 2-3/4" Phillips Flat Head Concrete Tapcon Screw with Blue Ruspert, 16mm M6 Stainless Steel Head Blue Concrete Anchor Screws Blue Concrete Screw, Blue Dacromet Phillips Csk Head Concrete Construction Screw for Floor Slab and so on.