1-7/8" X 7/16" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Overall Length: 5-3/8"

Overall Length: 5-3/8"

Each driver rests in its own slot

Length: 2 1/2"

Grade: High Speed Steel

1-7/8" X 7/16" Pilot Hole HSS Straight Shank Counterbore Quantity:1 Overall Length: 5-3/8"Product 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