Irwin 1882786 Countersink Replacement Drill Bits, # 4

Highlights:

• Bit # 4
• Tapered drill with widened flutes for drilling fast. clean pilot holes
• 1/4 quick change shank reduces slipping in standard chucks and is compatible with all 1/4 quick change chucks. including impact drills
• Adjustable four-cutter counterbore cuts and clears chips quicker for fast. smooth countersinking
• Counter bore attaches to flats on shank with two hex screws for a secure fit and can be adjusted for controlled pilot hole depth