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Link Industries - 0.28″ Drill, 3/8″ Pilot Length, High Speed Steel Bright Finish Combo Drill & Counterbore - 56443971 - MSC Industrial Supply
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Amana AA55102 Countersink and Counter Bore Drill Bit - RTA Furniture Drill/Countersink - 3.5 mm Diameter
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Amazon.com: 1 3/8" Aircraft Counterbore, Carbide Tipped, (Reduced Shank Counterbore), 3/8" Shank Diameter, 3 Flutes, 2 3/4" OAL, (1.375" Diameter, 1-3/8), 52244, USA Made : Industrial & Scientific
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7Pcs/set Counterbore Drill Bit Sets HSS Counterbore End Milling Cutter M3.2-M12.4 Countersink Drill Bits Pilot Slotting Milling Cutter End Mill Cutting Tool Set for Copper Aluminum Cast Iron - Amazon.com
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