Features 1. Self-drilling screws enable drilling without first creating a pilot hole. These screws are usually used to join materials like sheet metal. It speed installation by drilling, tapping, and fastening wood and metal in a single operation; 2. 410 stainless steel has high strength and hardness, with light magnetic, it has weak corrosion resistance, not suitable to used in saltwater; while zinc plated has better corrosion resistance; 3. Perfect for metal, wood, plastics, and other similar materials, self drilling tips avoid pre-drilling holes. Specification Item: self drilling screw Material: 410 stainless steel & zinc plated carbon steel Sizes: M4.2 M4.8 QTY: 30pcs Package: Opp bag FAQ 1.Wholesalers and retailers are welcomed. For wholesale,we will offer discount or free express shipping which only takes short time to arrive. If you are a retailer and want make your own business...