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Drill America DEWCBRTS7/16 7/16" X 5/32" Pilot Hole HSS Taper Shank Counterbore, DEWCBRTS7/16 Shop By Category > Welding & Cutting>Cooling Hoses Central Tools 6483 Master EngDrill America DEWCBRTS7 16 7 16" X 5 32" Pilot Hole HSS Taper Shank Counterbore, DEWCBRTS7 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