REDUCE NOISE AND 150KG MAXIMUM LOAD BEARING：Barn door hardware roller material:PREMIUM NYLON(attention:all the rollers in the market are made of nylon,if not,it will be have large noise). Sliding door rail :Carbon steel.The sturdy sliding rail track can support up to 150kg. FIT DOOR PANEL WIDTH AND THICKNESS:The barn door kit for single door.Surface: frosted black. Roller diameter: 69.9mm. Sliding rail thickness: 5.8mm. Sliding rail track width: 39.9mm. Fit for door panel width: maximum 1600 mm. Fit for door panel thickness: 35 mm-55 mm. SUITABLE FOR INTERIOR WOODEN DOORS:The sliding door kits are design for interior doors,but some of the buyer also used in outdoor ,the rusty rails look very feel. What you need do is keep it well oiled. SIMPLE INSTALLATION STEPS:Barn door sliding kit package Includes: 3*3.5ft barn door rail, 2 rollers, other accessories for installation (screws, wall attachment, door stops, floor guide, install manual etc.). The barn door panel is not included. PLEASE REST ASSURED TO BUY：We are guarantee 5 years factory warranty. If you have any questions, please contact us first, we will contact you within 8 hours,Solve the problem for you until you are satisfied., Weight: 7.71617917 Pounds, Manufacturer: cool artist