3/4" X 1/4" Pilot Hole HSS Taper Shank Counterbore - High Performance & Durable Cutting Tool | Drill America Welding Supplies Drill America - 2-3/4 x

Drill America - 2-3/4 x 1/2 x 1 45 degree HSS Double Angle Cutter

Stepped Point Cobalt Drill Bits start easier

Size: 2-3/8"

Drill America - 3/8-60 UNS HSS Tap Set

3/4" X 1/4" Pilot Hole HSS Taper Shank Counterbore - High Performance & Durable Cutting Tool | Drill America Welding Supplies Drill America - 2-3/4 xCounterboring 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 counterbore cutter, and a