The Hettich Grant TopLine 71-222 Single Barn Door Hardware is a medium-duty commercial and residential grade sliding door hardware series. It is ideal for single and bi-parting installations. Applications include doors between rooms, closet doors, cabinets, storage walls, and partitions. The heavy-duty aluminum I-beam track is a jump-proof design; while the pivoting rocker arms ensure track-carrier contact. For 3/4 (19 mm) thick minimum doors weighing up to 150 lbs. Heavy-duty aluminum I-beam track, jump-proof design. Precision ball bearing wheels ensure smooth, quiet, and long-lasting performance. Does not include end bumper stops. Ball and socket suspension compensates for minor header misalignment. Locknut ensures permanent positioning. 1 – Single Track 7001. 2 – Carriers 7000 Precision Ball Bearing Wheels (113 333 9). 2 – Top Plates with Adjustable Pendant Bolts 7222 (050 566). 1 – Floor Guide 110 (050 101).