Drill America DEWCBR15/16 15/16" X 1/4" Pilot Hole HSS Straight Shank Counterbore, DEWCBR15/16 Shop by Category > Hand Tools>Drill Bits Brush Research GBD150032 Gbd 15"

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Drill America DEWCBR15/16 15/16" X 1/4" Pilot Hole HSS Straight Shank Counterbore, DEWCBR15/16 Shop by Category > Hand Tools>Drill Bits Brush Research GBD150032 Gbd 15"Drill America DEWCBR15 16 15 16" X 1 4" Pilot Hole HSS Straight Shank Counterbore, DEWCBR15 16 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