9/16" X 3/8" Pilots for Counterbore BoltsandNuts.com stout shank that is heat

stout shank that is heat treated to 52–56 HRC to make the blade strong without being brittle

Part Number D/ACTH

Size: 10 ml

Size 7/8"-27

Part Number: BIT-DMS04-1073

9/16" X 3/8" Pilots for Counterbore BoltsandNuts.com stout shank that is heatProduct 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