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Drill America DEWPIL7/8X3/8 7/8" X 3/8" Pilots for Counterbore, DEWPIL7/8X3/8 Shop By Category > Hand Tools > Reamers>Straight Blade Brush Research BNS6AY500AO Bns-6ay 500aoDrill America DEWPIL7 8X3 8 7 8" X 3 8" Pilots for Counterbore, DEWPIL7 8X3 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 are made of