5/16"-18 x 1-1/2" Drilit Self-Drilling Screws, 3/8" Hex Washer Head, #3 Point, Case Hardened Carbon Steel with Stalgard Coating

5/16"-18 x 1-1/2" Drilit® self-drilling fasteners with hex washer head eliminate separate drilling and tapping operations for faster, more economical installations. Coated with Stalgard® corrosion resistant coating, this finish typically shows no red rust or other base metal corrosion on significant surfaces after 1000 hours of 5% neutral salt spray exposure - per ASTM B117.