Klein Tools 59002 No.2 Step Drill Bit Single flute cutter for a true round hole every time Works in most metals, plastic and wood Tri-lobe shank for firm grip in drill chuck Depth penetration for each step: 1/8-Inch Electric drill size: 1/2-Inch and larger. Number of Hole Sizes per Bit: 8 in 1/16-Inch increments