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Drill America DEWCBR31/32 31/32" X 5/16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR31/32 Wheel & Tire Tools>Axle Seal Installer Do you need hard-to-find blastDrill America DEWCBR31 32 31 32" X 5 16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR31 32 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