Screw, Fastener, Self-Drilling Screw manufacturer / supplier in China, offering Xrf 3.5-4.8mm Phosphate Drywall Screws for Multipurpose Construction Use, Xrf Collated Drywall Screws Self Tapping Screws for Metal Stud and Wood Frame Construction, Xrf Zinc Plated Drywall Screw - Heavy Duty Wall & Ceiling Fixing and so on.