5/16" X 3/32" Pilot Hole HSS Taper Shank Counterbore Quantity:1 Overall Length: 4-7/16"

Overall Length: 4-7/16"

Part Number DULSH7

Shank Size: 35/64"

Part Number: EZ-SK30915

Part Number D/ARSD1-7/16

5/16" X 3/32" Pilot Hole HSS Taper Shank Counterbore Quantity:1 Overall Length: 4-7/16"Product 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