Thread Size: #12, No.12 (4.9mm to 5.5mm) Screw Length: 3/4 inch (including the tip point) Hex Drive Size: 4mm; Package: 50 PCS Head Diameter: 12mm; Head Height: 2mm Material: 410 Stainless Steel is hardenable martensitic stainless steel alloy which contains 11.5% chromium. It's generally used for applications involving mild corrosion, heat resistance and high strength. It provides higher strength while less resistant to corrosion when compared with austenitic grades like 304 SS or 316 SS. #8 x 5/8" Wafer Head Self Drilling Screws, 410 Stainless Steel, Mushroom Head Phillips Drive Self Tapping Screws, 100 PCS