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 pilot that is interchangable, which provides flexibility in the use of the tool.
| Overall Length | 4-3/8 in |
|---|---|
| Shank Dia. | 7/16 in |
| Material - Machining | High Speed Steel |
| Number of Flutes | 2 |
| Bore Dia. | 3/8 in |
| Shank Type | Round |
| Finish | Uncoated |
| Body Dia. | 19/32 in |
| Country of Origin (subject to change) | China |
| Package Quantity | 1 |