1" X 3/8" Pilots for Counterbore BoltsandNuts.com and a maximum round jaw

and a maximum round jaw capacity of 2

4 mm • 10-pc

Jobber length drill blanks are precision-ground cylindrical rods made from high-speed steel (HSS)

Body Dia 21/64"

1" X 3/8" Pilots for Counterbore BoltsandNuts.com and a maximum round jawProduct 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