Southwire 3 8 in High Speed Steel 5 Step Drill Bit Curtain rings Customize step with the tile Customize step with the tile of your choice to fit the look and feel of your shower (tile not included) Comes with quick click system for connecting to the exhaust port on all major brands of hand held and stationary power tools Sub Brand N A Number of Hole Sizes 5 Diameters of Holes Drilled 1 4 in to 1 3 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