You're looking at a brand new fully adjustable leathercraft swivel knife, with blade.
The barrel is 11mm in diameter. This high quality swivel knife offers a smooth and balanced alternative to the standard swivel knives and will offer a lifetime of service for a great price.
To adjust the length, simply loosen the grub screw with the Allen Key that comes with the knife, raise or lower the finger cup as desired and re-tighten the grub screw.
Fits standard swivel knife blades.