Kratos 1 3 4 Inch Smooth Shank Hot Dipped Galvanized Coil Nails 15 Degree Wire Weld 0.092 Diameter Siding Fencing Fasteners 6000 Count Bulk Case Auger Bit 375 in (3 8 in Reduced 375 in (3 8 in Reduced Shank) Shank Type Straight Round Reduced Shank Point Angle 135° Split Point (Self Centering) Material Metallurgy Cobalt Alloy High Speed Steel Surface Finish Precision Ground Gold Oxide Flute Format Jobber Length Spiral Flute Package Quantity 6 Drill Bits Material Compatibility Stainless Steel The 1 3 8 inch overall diameter cutter incorporates a 3 1 16 inch carbide cutting height coated with a non stick red Perma SHIELD fluoropolymer barrier 000 Count) Over driving (countersinking) can break the protective zinc barrier and create a "cup" where water can collect