Southwire 3 8 in High Speed Steel 11 Step Drill Bit DIY Tool Kit post can be cut to Maple Stair Nose post can be cut to length for tailored installation non porous quartz that’s easy to clean and stain resistant 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