Tapered Wood Countersink Tool #10 *Material: High Speed Steel *Drill Bit Diameter: 3/16 in. *Product Type: Countersink *Shank Diameter: 1/4 in. *Packaging Type: Carded *Application: Wood *Bit Size Type: #10* Tapered drill with widened flutes for drilling fast, clean pilot holes * Adjustable four-cutter counterbore cuts/clears chips for fast, smooth countersinking *Counterbore attaches to flats on shank with two hex screws for a secure fit * Adjustable for controlled pilot hole depth * 1/4" quick-change shank reduces slipping in standard and quick-change chucks *Discovery ACC, NBR, SUP