5/16" X 3/32" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Part Number T/A57041TN

Part Number T/A57041TN

Part Number: BIT-T/A54761

Part Number: 50C300HTBB/FT

Part Number: DUR297B-95

They are tested to ensure they meet IEC 60900:2018 and ASTM F1505-16 standards

5/16" X 3/32" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Part Number T/A57041TNProduct 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