1" X 3/16" HSS Aircraft Counterbore 1/4" Shank BoltsandNuts.com There is a deep knurled

There is a deep knurled grip in the middle of the tool

5 HRC for use on impact wrenches

Size SA-12

Part Number: VibraTite90728oz

Part Number: 100C275HCSSS

1" X 3/16" HSS Aircraft Counterbore 1/4" Shank BoltsandNuts.com There is a deep knurledProduct Description 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 counterbores are made of two piece construction, having an integral shank and