Drill America DEWCBRTS1-5/16 1-5/16" X 3/8" Pilot Hole HSS Taper Shank Counterbore, DEWCBRTS1-5/16 Shop by Category > Measurement>Misc Gauges/Sets To ensure proper operation do

To ensure proper operation do not modify the hole in anyway

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Drill America DEWCBRTS1-5/16 1-5/16" X 3/8" Pilot Hole HSS Taper Shank Counterbore, DEWCBRTS1-5/16 Shop by Category > Measurement>Misc Gauges/Sets To ensure proper operation doDrill America DEWCBRTS1 5 16 1 5 16" X 3 8" Pilot Hole HSS Taper Shank Counterbore, DEWCBRTS1 5 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