Sherline 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 3064 is 5/16" but has a longer 1.5" reach. If desired, they can easily be ground down to work in a smaller hole.
Sherline Boring Tools Instructions
CA Prop 65 WARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use dust mask or other safeguards for personal protection.
I can do all this through him who gives me strength. Philippians 4:13