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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 counterbores are made of two-piece construction, having an integral shank and counterbore-cutter, and a pilot that is interchangable, which provides flexibility in the use of the tool.
Brand Drill America
Part Number DEWCBRSOL2
Body Dia 0.155
Material High Speed Steel
Pilot Dia
Shank Size
Shank Type Round
Finish Uncoated (Bright)
Number of Flutes 2
Length 2-1/8″
