Roofing Screw, Drywall Screw, Blind Rivet manufacturer / supplier in China, offering ASTM F436 Structural HDG Hardened Steel Washer, Carbon Steel Zinc Knurling Drop in Anchor, DIN471 DIN472 A2-70 Stainless Steel Black Plated Shaft Circlip Outer Retaining Ring Snap Ring and so on.