Irwin 1882784 TAPERED COUNTERSINK TOOL

Irwin 1882784 No.12 Wood Countersink. Screw size: No.12. Bit diameter: 7/32″. Counterbore size: 7/16″. Plug size: 7/16″. Shank size: 1/4″. Tapered drill features widened flutes for drilling fast, clean pilot holes. 4-cutter, adjustable counterbore cuts and clears chips for fast, smooth countersinking. Counterbore attaches securely to the flats on the shank with hex screws and adjusts for controlled pilot hole depth. 1/4″ Quick-change shank reduces slipping in standard chucks. Compatible with all 1/4″ quick-change chucks (including impact drills).