This aluminum miter track KMS7402 is ideal for outfitting your router table with a 3/4" x 3/8" groove for a miter guide. The bottom of the track is slightly cambered across its width, so that tightening the mounting screws pulls the side walls just a little closer together; it's an adustable track. This means you can establish a good fit for your miter guide regardless of the bar's precision. Comes in 42" length and can be cut to length with a hacksaw. Mounting screws included.