Heavy Duty Double Door Sliding Barn Door Hardware Kit Heavy-duty barn door hardware: Solid carbon steel, rated up to 350 lbs, fully covered in black powder coat, water and rust resistant, for two 24″ wide, 1-3/8″ 1-3/4 thick doors. Full protection: two pre-drilled 4-foot tracks, five American-style wall stud spacers ensure even clearance to walls for mounting on wood and concrete walls, and four rubber-padded door stops and end caps that close more comfortably and avoid swinging when impacted Full protection: Two pre-drilled 4-foot tracks, five American-style wall stud spacers ensure even clearance to walls for mounting on wood and concrete walls, and four rubber-padded door stops and end caps that close more comfortably and avoid swinging when impacted Sliding barn door hardware kit: The whole kit comes with 2 x 4FT rails, 5 x rail spacers, 4 x rollers, 4 x door stops, 4 x end caps, 2 x floor guide, 1 x hexagonal wrench and all other accessories needed for installation, which can be easily installed according to the instructions.