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Size: 1-1/2"-12
" - Mark T
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2-5/8" X 1/2" Pilot Hole HSS Taper Shank Counterbore - High Performance & Durable Cutting Tool | Drill America Hole saws Size: 1-1/2"-12Counterboring 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