Drill America DEWCBR35/64 35/64" X 3/16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR35/64 Shop By Category > Fuel System & Ignition > Fuel Injector Tools>Testers/Cleaners Drill America D/AA/CX67/16 7/16" x

Drill America D/AA/CX67/16 7/16" x 6" HSS Aircraft Extension Drill Bit

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Drill America DEWCBR35/64 35/64" X 3/16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR35/64 Shop By Category > Fuel System & Ignition > Fuel Injector Tools>Testers/Cleaners Drill America D/AA/CX67/16 7/16" xDrill America DEWCBR35 64 35 64" X 3 16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR35 64 Counterboring is the enlargement of a portion of a hole that has previously been formed. If the counterbored portion is shallow (1 8" or less), the operations is usually known as spot facing; for example, a flat seat for a bolt head or nut. If, on the other hand, the hole is enlarged to a considerable depth, it is designated as counterboring. These