Irwin 1882792 Countersink Bit Set, Specifications: 1/4 in Shank, HSS, Includes: #4, #6, #8, #10, #12 #14 Countersinks

Tapered drill with widened flutes for drilling fast, clean pilot holes. Adjustable four-cutter counterbore cuts and clears chips quicker for fast, smooth counter sinking. Counterbore attaches to flats on shank with two hex screws for a secure fit and can be adjusted for controlled pilot hole depth. 1/4 in quick change shank reduces slipping in standard chucks and is compatible with all 1/4 in quick change chucks and impact drills. Set includes (2) depth stops, (1) #4, (1) #6, (1) #8, (1) #10, (1) #12 and (1) #14 bit.