57/64" X 1/4" Pilot Hole HSS Straight Shank Counterbore Quantity:1 A4-70 Stainless Split Lock Washers

A4-70 Stainless Split Lock Washers

Part Number DWDTS1-23/64

Point Type: Oval Point

Trade Size AL-12C2

Part Number: EZ-450-12

57/64" X 1/4" Pilot Hole HSS Straight Shank Counterbore Quantity:1 A4-70 Stainless Split Lock WashersProduct 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