The Incra TTRACKREG18 is a 18-Inch Single Track T-Track. Add accuracy and precision to your jigs and fixtures with T-Track from Incra. These tracks are designed with a host of enhancements. Like other tracks, the extruded anodized aluminum construction is designed to house a 1/4-Inch-20 bolt head, but thats where the similarity ends. First, these tracks feature a well in the extrusion allowing the track to be mounted using the included #8 pan head screws versus #6 flat head screws used by other tracks. The extra depth of the well allows the use of 1/4-Inch-20 nuts that are not accommodated by other tracks. The T-Track is sized for a 3/4-Inch wide opening. Features: * Large T-Slot accepts standard 1/4-20 hex bolts and nuts * Mount easily with pre-drilled holes and included fasteners * Hard anodized aluminum for durability * Can be cut to fit your jig exactly What"s In the Box: * Incra TTRACKREG18 18-Inch Single Track T-Track