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O'Skool 9/32 Inch x 1/2 Inch Counterbore Drill for 1/4" Screws, Flat countersunk Drill bit, Flat Countersink Drill bit, Stepped Drill, Step Drill - Amazon.com
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Link Industries - 0.532″ Drill, 9/16″ Pilot Length, High Speed Steel Bright Finish Combo Drill & Counterbore - 56444003 - MSC Industrial Supply
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1 1/2" Aircraft Counterbore, Carbide Tipped, (Reduced Shank Counterbore), 3/8" Shank Diameter, 3 Flutes, 2 3/4" OAL, (1.5" Diameter, 1-1/2), 52248, USA Made: Amazon.com: Industrial & Scientific
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Amazon.com: Chiloskit 5pcs M3-M8 Pilot Slotting Counterbore Mould End Mill Cutter Solid Slot Countersink End Mill Drill Bit : Industrial & Scientific
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