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Drill America DEWCBR43/64 43/64" X 3/16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR43/64 Shop By Category > Air Tools>Caulking Guns Coilhose Pneumatics SC690402 Econolock SpeedDrill America DEWCBR43 64 43 64" X 3 16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR43 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