OVIS is phasing this kit out as more carrier options are availible than can be stocked in kits. You can still buy the same standard hardware kit and track seperately.Grant Top Line SD Series Box Track, 8 Foot, Anodized Finish, Hardware Kit, 150 Lbs.The Top Line Grant HD Series is a heavy duty commercial and residential grade sliding door hardware series ideal for single and bi-parting installations. It has a weight capacity of 150 lbs. per door. Applications include the movement of heavy panels, space dividers or large doors. This kit is designed for one 4 foot door with 4 feet of travel.Although designed for single doors, by-passing doors can be accommodated by mounting parallel tracks. By using one additional set of hardware, bi-parting installations can be achieved. The track is available in lengths up to 16 feet (4876 mm).