5/16" X 3/32" Pilot Hole HSS Taper Shank Counterbore - High Performance & Durable Cutting Tool | Drill America Pipe Clamps Ideal for threading a wide

Ideal for threading a wide variety of ductile materials

Drill America - 3-1/4-8 UNS HSS Tap Set

Thread Size: m8

Style: Shell Reamer Arbor

5/16" X 3/32" Pilot Hole HSS Taper Shank Counterbore - High Performance & Durable Cutting Tool | Drill America Pipe Clamps Ideal for threading a wideCounterboring 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