Screw, Self Drilling Screw, Self Tapping Screw manufacturer / supplier in China, offering Durable Low Driving Torque Screw Customizable Screw for Specific Industrial Construction Needs, 1022A High-Quality Carbon Steel Countersunk Head Zinc Plated Reinforced Ribs Double Wings Self-Drilling Screw, Customized Ral Color Plated Metal Roofing Hex Wahser Head Self-Drilling Screw and so on.