Screws, Fastener, Self-Drilling Screw manufacturer / supplier in China, offering Hexagon Flange Head Self-Drilling Screws with Rubber Washer, Zinc Plated Hexagon Flange Head Self-Drilling Screws Roofing Screw with Rubber Washer, Hex Flange Head SDS Tek Screw Zinc Plated with EPDM Washer and so on.