Irwin Industrial Tools 43034 2-1/8-Inch Self Feed Bit
2-1/8" Diameter, Self Feed Drill Bit, 7/16" Hex Quick Change Impact Shank That Fits1/2" Or Larger Drills, Also Fits 7/16" Hex Impact Wrench Drills, For Drilling Large Diameter Holes In Wood, Includes Replaceable Coarse Screw Point, Precision Milled Shank Eliminates Run Out & Wobble, Forged In 1 Piece From High Carbon Steel For Max Strength Under Tough Drilling Conditions, Ideal For Pipe & Conduit Systems, Carded.