Irwin Industrial Tool Co 1882781 #6 WD Countersink

6 Wood Countersink, Tapered Drill, Widened Flutes For Drilling Fast, Clean Pilot Holes, 4 Cutter, Adjustable Counter Bore Cuts & Clears Chips For Fast, Smooth Countsinking, Counter Bore Attaches Securely To The Flats On Shank With Hex Screws & 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, Use For Fine Woodworking Projects, Bit Diameter 9/64″, Counter Bore Size 5/16″, Plug Size 5/16″, Shank Size 1/4″.