1-1/2" X 3/8" Pilot Hole HSS Taper Shank Counterbore - High Performance & Durable Cutting Tool | Drill America Welding Tools & Clamps Fire Resistance: Flame-resistant (FR) fabric

Fire Resistance: Flame-resistant (FR) fabric

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Style: Adjustable

Tap Drill Size: 33mm

Pipe Sizes: 4 inches to 72 inches diameter

1-1/2" X 3/8" Pilot Hole HSS Taper Shank Counterbore - High Performance & Durable Cutting Tool | Drill America Welding Tools & Clamps Fire Resistance: Flame-resistant (FR) fabricCounterboring 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