1/2" X 1/8" HSS Aircraft Counterbore 1/4" Shank Quantity:1 and 3/4 inch drive impact

and 3/4 inch drive impact adapters and 3/8

Size: 5/32"

Finish: Black Oxide

9 Hex Flange Screws DIN 6921 Black Phos & Oil

1/2" X 1/8" HSS Aircraft Counterbore 1/4" Shank Quantity:1 and 3/4 inch drive impactProduct 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