M3 Screws 410 SS Inox Hex Washer Wafer Truss Head Tek Roofing Self Drilling Screw Stainless Steel , China Self Tapping Screws For Metalwork [Design]: The metal sheet screws are designed with an external hex drive style with washer, preventing slippage and ensuring a strong hold. 410 Stainless Steel Self-Drilling Screws | Pro Fastening Systems [Good Choice]: Hex washer head self-tapping screws are widely used for furniture, household goods, electronics, communications, power products, floor fastening, industrial, construction, machinery, equipment maintenance, and other DIY projects. 410 Stainless Steel Self-Drilling Screw, Plain Finish, Hex Washer Head, Hex Drive, 3 Drill Point, 12-24 Thread Size, 2 Length (Pack of 10 [Hex Washer Head Self Tapping Screws]: The package comes with 50pcs of hex washer head self tapping screws in Thread Size: #10x3(ST4., 8x75mm); Thread Pitch: 1., 6mm; Head Dia., : 8mm/ 0., 31; Washer Head Thickness: 10., 15mm/ 0., 4; Head Thickness: 4., 3mm/ 0., 17; Screw Drilling Range(Plate Thickness): 1., 75-4., 4mm / 0., 07-0., 17inch Self-Drilling Screws at Tractor Supply Co For harder materials, it is recommended to pre-drill with a drill to make it easier to insert the screws.