IDEAL, 1/4 in Pilot Bit Shank Size, 1/4 in Pilot Bit Size, Pilot Drill Bit - 10F521|36-312 - Grainger
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Milwaukee Part # 49-56-8000 - Milwaukee 1/4 In. X 4 In. Pilot Drill Bit For Hole Saw Arbor - Drill Bits - Home Depot Pro
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