1" X 5/16" Pilot Hole HSS Taper Shank Counterbore BoltsandNuts.com Part Number: BIT-SDS7326

Part Number: BIT-SDS7326

Part Number DWTS24X2

dry wall and cast iron

Part Number: M16F140HCS88Z

1" X 5/16" Pilot Hole HSS Taper Shank Counterbore BoltsandNuts.com Part Number: BIT-SDS7326Product 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