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Drill America DEWA/CCBR5/16 5/16" X 3/32" HSS Aircraft Counterbore 1/4" Shank, DEWA/CCBR5/16 Shop By Category > Hand Tools>End Mills Coilhose Pneumatics 27FC3-G 3/8" IntegralDrill America DEWA CCBR5 16 5 16" X 3 32" HSS Aircraft Counterbore 1 4" Shank, DEWA CCBR5 16 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