Drill America DEWA/CCBR21/32 21/32" X 3/16" HSS Aircraft Counterbore 1/4" Shank, DEWA/CCBR21/32 Shop by Category>Air Filtration if you're unable to find

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Drill America D/ARSD1-15/32 1-15/32" Reduced Shank HSS Drill Bit

Brush Research BMC12AY320AO Bmc-12ay 320ao Mandrel Mounted

Inside Diameter: 5/16"

Drill America DEWA/CCBR21/32 21/32" X 3/16" HSS Aircraft Counterbore 1/4" Shank, DEWA/CCBR21/32 Shop by Category>Air Filtration if you're unable to findDrill America DEWA CCBR21 32 21 32" X 3 16" HSS Aircraft Counterbore 1 4" Shank, DEWA CCBR21 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