27/64" X 5/32" Pilot Hole HSS Straight Shank Counterbore Quantity:1 square dies provide durability and

square dies provide durability and accurate threading

Part Number T/A64009

Part Number: EZ-SK21115

Part Number T/A54935

27/64" X 5/32" Pilot Hole HSS Straight Shank Counterbore Quantity:1 square dies provide durability andProduct 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