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Drill America DEWCBRTS1-7/16 1-7/16" X 3/8" Pilot Hole HSS Taper Shank Counterbore, DEWCBRTS1-7/16 Shop by Category>Measurement Chadwick & Trefethen 61140 14mmDrill America DEWCBRTS1 7 16 1 7 16" X 3 8" Pilot Hole HSS Taper Shank Counterbore, DEWCBRTS1 7 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