Drill America DEWA/CCBR31/32 31/32" X 3/16" HSS Aircraft Counterbore 1/4" Shank, DEWA/CCBR31/32 Shop by Category > Hand Tools > Wrenches>Filter Chadwick & Trefethen 35400 3/4"

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Drill America DEWA/CCBR31/32 31/32" X 3/16" HSS Aircraft Counterbore 1/4" Shank, DEWA/CCBR31/32 Shop by Category > Hand Tools > Wrenches>Filter Chadwick & Trefethen 35400 3/4"Drill America DEWA CCBR31 32 31 32" X 3 16" HSS Aircraft Counterbore 1 4" Shank, DEWA CCBR31 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