Drill America DEWCBR49/64 49/64" X 1/4" Pilot Hole HSS Straight Shank Counterbore, DEWCBR49/64 Shop By Category > Sand Blasting>Gun Assembly CTA 8510 Wrench Set Stubby

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Drill America DEWCBR49/64 49/64" X 1/4" Pilot Hole HSS Straight Shank Counterbore, DEWCBR49/64 Shop By Category > Sand Blasting>Gun Assembly CTA 8510 Wrench Set StubbyDrill America DEWCBR49 64 49 64" X 1 4" Pilot Hole HSS Straight Shank Counterbore, DEWCBR49 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