1-3/16" X 1/2" Pilots for Counterbore Quantity:1 3/4" Weldon Shank fits most

3/4" Weldon Shank fits most magnetic drill presses

Part Number: 87CNNMB

Part Number: BIT-DWDP13/32

Part Number DMOD9

1-3/16" X 1/2" Pilots for Counterbore Quantity:1 3/4" Weldon Shank fits mostProduct 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