Our Heavy Duty Trak is an L-shaped, anodized aluminum extrusion that is extremely straight and perfect for heavy use commercial applications. Contains four T-slots which accommodate the head of a standard 1/4" hex bolt. This is the same extrusion that is included in the Deluxe Miter Gauge System. A 1/2" recessed indentation runs along the top and frontside of the trak for easy application of a self-adhesive measuring tape. This trak is intended to be mounted to a shop-made subfence with standard 1/4" bolts (not included).