Drill America DEWCBR57/64 57/64" X 1/4" Pilot Hole HSS Straight Shank Counterbore, DEWCBR57/64 Shop By Category > Sand Blasting>Parts Chadwick & Trefethen 50870 1087

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Drill America DEWCBR57/64 57/64" X 1/4" Pilot Hole HSS Straight Shank Counterbore, DEWCBR57/64 Shop By Category > Sand Blasting>Parts Chadwick & Trefethen 50870 1087Drill America DEWCBR57 64 57 64" X 1 4" Pilot Hole HSS Straight Shank Counterbore, DEWCBR57 64 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