31/64" X 3/16" Pilot Hole HSS Straight Shank Counterbore - High Performance & Durable Cutting Tool | Drill America Cleaning Supplies **Product Specifications:** **Size:** 1-3/16" **Material:**

**Product Specifications:** **Size:** 1-3/16" **Material:** High Speed Steel **Finish:** Black Oxide **Flute Length:** 7-3/8" **Overall Length:** 12" **Shank Type:** Round **Key Features:** - A dependable

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31/64" X 3/16" Pilot Hole HSS Straight Shank Counterbore - High Performance & Durable Cutting Tool | Drill America Cleaning Supplies **Product Specifications:** **Size:** 1-3/16" **Material:**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