Screw, Bolts, Nuts manufacturer / supplier in China, offering Masonry Anchor 10b21 Self Drilling for Concrete Construction Concrete Screw, High Quality SAE Standard Durable Fasteners for Reliable Connections in Automotive and Construction Projects Flange Bolts, Carbon Steel 4.8 Grade Blue and White M6 * 10 Hexagon Flange Bolts and so on.