Drill America DEWCBR21/32 21/32" X 3/16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR21/32 Shop by Category > Engine>Spark Plug Brush Research BDH6S12 Bdh-6s

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Drill America DEWA/CCBR17/32 17/32" X 1/8" HSS Aircraft Counterbore 1/4" Shank

Drill America DEWCBR21/32 21/32" X 3/16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR21/32 Shop by Category > Engine>Spark Plug Brush Research BDH6S12 Bdh-6sDrill America DEWCBR21 32 21 32" X 3 16" Pilot Hole HSS Straight Shank Counterbore, DEWCBR21 32 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