IRWIN 3 8 in 12 Step Drill Bit Flooring Samples tempered glass with solid brass Mortar Mixes tempered glass with solid brass pivots and anodized aluminum profiles Applications to woody brush and vines should be in the spring to early summer when plants are in full leaf stage Sub Brand NA Brand Model Compatibility Universal Number of Hole Sizes 12 Diameters of Holes Drilled 3 16 in to 7 8 in Step Size 1 16 in Shank Size 3 8 in Shank Type Hex Material Cobalt Set Individual Individual Package Quantity 1 Warranty None CA Residents: Prop 65 Warning(s) Yes wood and laminates 3 flatted shank won't slip in chuck SpeedPoint tip for fast starting Laser marked sizes won't wear off with use