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Drill America DEWCSCBR7/8 7/8" 15/16" Continuous Pilot Capscrew Counterbore, DEWCSCBR7/8 Shop By Vehicle>Ford Drill America DEWMSK2-60 2"-60 HSSDrill America DEWCSCBR7 8 7 8" 15 16" Continuous Pilot Capscrew Counterbore, DEWCSCBR7 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 counterbores