Called Top Trak because it mounts to the top-side of a shop-made 3/4" thick fence, this extremely versatile and rugged anodized aluminum extrusion works well with various woodworking machines. Trak features a self-aligning L-shaped mounting foot for easy installation to a shop-made fence. Just drill 1/8" holes through the back of the extrusion and secure with the included mounting screws. The top of the track contains a recess for attaching a self-adhesive 1/2" measuring tape, sold below. Patented.