National Hardware N186-990 Interior Sliding Door Hardware Kit, Black, 72"National Hardware #930 Interior Sliding Door Hardware Kit for single doors 1 3 8" and 1 3 4" thick. Accommodates openings of up to 36" wide. Create a unique office space with this interior sliding door hardware. Hang a closet door, barn door, or other interior door. For safe working results, use with doors 150 lbs. or less. Adds rustic appeal to interior door openings in a cost effective way to add style and privacy to an open doorway. Size: 72"