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

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