Sherline 3063 Boring Tool
These high-speed steel cutting tools are designed for use with the Sherline boring head. They have a 3/8″ (9.5mm) diameter shank. P/N 3063 is designed to work in a 5/16″ (7.9mm) minimum hole with a maximum depth of 1.00″ (25mm). If desired, it can easily be ground down to work in a smaller hole. The shank has a flat ground on one side that is for the set screw of the boring head to tighten against.