Product Description These self-piercing sheet metal screws are designed for joining thin pieces of metal to wood, fiberglass or metal primarily through a pre - drilled or own generated hole in light gauge metal. Great for general repair around the house. Self Piercing Screws penetrate metal and tap their own mating threads to eliminate the need for prepuce holes. From the Manufacturer These self-piercing sheet metal screws are designed for joining thin pieces of metal to wood, fiberglass or metal primarily through a pre - drilled or own generated hole in light gauge metal. Great for general repair around the house. Self Piercing Screws penetrate metal and tap their own mating threads to eliminate the need for prepunched holes. Attached Steel Backed Neoprene Washer Needle Point Gray Ceramic Coating From The Brand Name: The Hillman Group UPC 008236981964 Brand Hillman Color grey Model 48278 Head Type Hex Size Name 1.5 inches Metal Type Alloy Steel Item Weight 5.47 Pounds Part Number 48278 Thread Size #10 Thread Type Self-threading Drive System External Hex Manufacturer The Hillman Group Thread Class standard Thread Style Right Hand Fastener Size #10 x Fastener Type Roofing Screw Material Type Steel Exterior Finish Epoxy Item Dimensions 5 x 7.4 x 4.8 inches Number Of Items 500 Thread Coverage Fully Threaded Number of Pieces 500 Screw Head Style Hex Screw Point Style Self-Piercing Point Set Screw Thread Type Unified National Coarse (UNC) Global Trade Identification Number 00008236981964