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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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36420 - 5/16" x 1" 3-Flute Flat Bottom Counterbore with TiN coated twist drill - Make it Snappy Tools
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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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