IDEAL, 1/4 in Pilot Bit Shank Size, 1/4 in Pilot Bit Size, Pilot Drill Bit - 10F521|36-312 - Grainger
Centering Pilot Bit 1-1/4" F to 5/8" M Core Bit to Drill Adapter by BLUEROCK ® Tools Model #19 - BLUEROCK Tools
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Amazon.com: Simpson Strong Tie CTRBTF04304 Core Bit Center Pilot Bit for Concrete, 7/16-Inch Diameter and 4-3/4-Inch Overall Length : Tools & Home Improvement
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