11/16" X 5/16" Pilots for Counterbore BoltsandNuts.com Diameter/Pitch: 1/2"-20

Diameter/Pitch: 1/2"-20

Part Number: 75C1000WA2G

Part Number D/ASTCO3/4

The center-to-center distance between the drive square and the hex opening is engraved on the handle for quick reference when using the service wrench as a torque adapter

Part Number: BIT-DWDCO25/32

11/16" X 5/16" Pilots for Counterbore BoltsandNuts.com Diameter/Pitch: 1/2"-20Product 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