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1/4' shank
Single concave flute design creates perfectly round holes in thin materials including steel
3/8" diameter
rafts and air mattresses
premium masonry grinding discs
Irwin 4-Piece Wood Countersink Bit Set Rotary Tools & Accessories 1/4' shankReplacement tapered drill bits with widened flutes for drilling fast, clean pilot holes. Adjustable 4 cutter counterbore cuts and clears chips quicker for fast, smooth countersink or counterbore drilling. Attaches and adjusts with 2 hex screws. Counterbore attaches to flat on shank for a more secure fit. Adjustable stop collar attaches to counterbore for controlling countersink depth. 1 4' quick change shank reduces slipping in standard chucks and is
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