Check the listing for details. INCRA T-Track Plus 18" length. Condition: New. Listed at 14.99 USD. NEW, INCRA T-Track Plus, 18" length, 142580, Adds accuracy and precision to your jigs, Allows the use of 1/4"-20 nuts, 18", Add accuracy and precision to your jigs and fixtures with T-Track Plus 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"-20 bolt head, but that’s where the similarity ends. First, this track features 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"-20 nuts that are not accommodated by other tracks. On the T-Track Plus there is the addition of a highly accurate Lexan scale that can be moved to a “zero” reference.