AUKTools' Solid Brass Inlay Kit includes a 1/8” downcut solid carbide spiral bit (1/4" Shank) for chip-free cutting, quick-change bushing, template guide and complete instructions. The router base required for fitting the guide bush must have a clear 30.16mm (1-3/16") diameter aperture. A sub-base adaptor may be required. This inlay set lets allows you to make perfect fitting inlay repairs and decorations. First make a template of your design. Install the precision machined bushing with collar and 1/8" diameter cutter in your router and follow the template to cut the design in your work. Remove the collar from the bushing and cut the positive inlay using the same template. You now have a perfect fitting inlay.