This complete kit lets you to do tight, precise inlay work with a router and templates of your own design. The kit includes a solid brass guide bushing, retaining nut and bushing collar, and a solid carbide down-cut spiral router bit for ultra-clean milling of both workpiece and inlay material. The guide bushing is made to fit Porter-Cable or Black & Decker router bases directly, and may be installed in most other routers with the help of an adapter ring designed to handle Porter-Cable bushings.