3/4" X 1/4" Pilot Hole HSS Straight Shank Counterbore - High Performance & Durable Cutting Tool | Drill America Extractors Drill Bit Size: 31/64"

Drill Bit Size: 31/64"

Overall Length: 41

Why Choose Drill America - 1/2-60 UNS HSS Tap Set

Tap Drill Size: 30

Drill America - 2-5/8 Precison Made Lathe Mandrel

3/4" X 1/4" Pilot Hole HSS Straight Shank Counterbore - High Performance & Durable Cutting Tool | Drill America Extractors Drill Bit Size: 31/64"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 counterbore cutter, and a