Southwire 3 8 in High Speed Steel 11 Step Drill Bit DIY Tool Kit ) 60 Substrate Surface Usage Type Color:PATRIOT RED ) 60 Substrate Surface Usage Type Wood Maximum Optimal Temperature (F) 90 Paint Stain Waterproofer Product Type Wood Deck Stain & Sealer Coverage Area (sq post can be cut to length for tailored installation Sub Brand N A Number of Hole Sizes 11 Diameters of Holes Drilled 3 16 in to 7 8 in Shank Size 3 8 in Shank Type Round Material High speed steel Set Individual Individual CA Residents: Prop 65 Warning(s) No Split point self starting tip requires no pilot hole and penetrates faster Tri lobe shank reduced slippage and firm grim in the chuck Laser etched sizes for easy identification Double flute design for fast cuts and a true round hole every time