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Drill America DEWCBR2-7/8 2-7/8" X 1/2" Pilot Hole HSS Straight Shank Counterbore, DEWCBR2-7/8 Shop By Category > Hand Tools>Hole Saws Brush Research BC10M12 Bc 10mmDrill America DEWCBR2 7 8 2 7 8" X 1 2" Pilot Hole HSS Straight Shank Counterbore, DEWCBR2 7 8 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