Drill America DEWCBR1-11/16 1-11/16" X 7/16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR1-11/16 Shop By Brand>Central Tools Blair 11201 Rotabroach Master Kit

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Drill America DEWCBR1-11/16 1-11/16" X 7/16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR1-11/16 Shop By Brand>Central Tools Blair 11201 Rotabroach Master KitDrill America DEWCBR1 11 16 1 11 16" X 7 16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR1 11 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