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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 cross recessed pan head screw, smooth and complete, stressed uniformly, hard to to skid in the process of spinning. 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: 150pcs Screw Diameter: #8 (4-4.2mm); Screw Length: 1/2 inches (13mm), 3/4 inches (19mm), 1 inch (25mm). Package Include: 50pcs #8x1/2 Inch Self-Drilling Truss Head Phillips Drive Dovetail Screws 50pcs #8x3/4 Inch Self-Drilling Truss Head Phillips Drive Dovetail Screws 50pcs #8x1 Inch Self-Drilling Truss Head Phillips Drive Dovetail Screws