Grant Top Line XHD Series Box Track, 6 Foot, Anodized Finish, 500 Lbs. Hardware Kit sold seperately.The Top Line Grant XHD 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 500 lbs. per door. Applications include the movement of heavy panels, space dividers or large doors. This track is designed for one 3 foot door with 3 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).