2-1/8" X 1/2" Pilot Hole HSS Taper Shank Counterbore Shopify Collective Internal Thread: 7/16"-14

Internal Thread: 7/16"-14

Size #4-48

and a 90-tooth quick-release ratchet in a Mini Stacking Tool Box

Pieces in Set 4

Tap Drill Size #29

2-1/8" X 1/2" Pilot Hole HSS Taper Shank Counterbore Shopify Collective Internal Thread: 7/16"-14Product 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