2-7/8" X 1/2" Pilot Hole HSS Taper Shank Counterbore Quantity:1 and the tightly mated fit

and the tightly mated fit results in a bit that won't loosen over time or under stress

Part Number: EZ-30570

Length 18"

spinner handle and two extensions–which aren’t often found in most sets

Part Number: 87C1000SHB307G

2-7/8" X 1/2" Pilot Hole HSS Taper Shank Counterbore Quantity:1 and the tightly mated fitProduct 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