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COUNTERSINK HSS#12 IRWIN *Brand Name: Irwin *Drill Bit Diameter: 7/32 in. *Material: High Speed Steel *Product Type: Countersink *Number in Package: 1 pc *Screw Size: #12 *Usage: Wood *Overall Length: 4.5 in. *Shank Type: Quick-Change Hex Shank *Packaging Type: Carded *Shank Diameter: 1/4 in. *Adjustable four-cutter counterbore cuts/clears chips for fast, smooth countersinking *Bit Size Type: #12 *Counterbore attaches to flats on shank with two hex screws for a secure fit *Tapered drill with widened flutes for drilling fast, clean pilot holes *Discovery ACC, CON, NBR, SUP