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These screws are made of 410 stainless steel, high hardness (40 Rockwell C), resists corrosion in mild environments, applied to steel-work. Standard hex washer head screw, can be easily installed with 1/4"hex driver. Precise screw design, the thread can decrease the resistance when screwing in, prevent cracking. There is no need to drill a hole first, sharp tail is easy to drill. Dimension: Screw Diameter: #8 (4.2mm); Screw Length: 1 inches (25.4mm); Head diameter: 6.25mm; Head Thickness: 3.1mm. Tapping head screw, complete drilling and tapping at one time. Use the drill point for drilling first, then use the screw for tapping and fastening, which can save time and enhance efficiency. Package Include: 50pcs #8x1 Inch Self-Drilling Hex Washer Head Tapping Screws