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"-20 bolt head, but that’s 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"-20 nuts that are not accommodated by other tracks. The T-Track is sized for a 3/4" wide opening.