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1-13/16" X 7/16" Pilot Hole HSS Taper Shank Counterbore - High Performance & Durable Cutting Tool | Drill AmericaCounterboring 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 two piece construction, having an integral shank and counterbore cutter, and a

On-Site and Shop Use: A versatile option for both on-site fieldwork and controlled shop environments

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along with a hex shank that reduces slipping during drilling

and larger than 1/2 have the 118 standard point

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