MATERIAL : Barn door sliding kit are made from high-quality carbon steel,sturdy and durable,with a maximum load capacity of 150kg.Surface:Matte black. LOW NOISE AND SMOOTH : Material of roller bearing:stainless steel;Barn door hardware rollers material:PREMIUM NYLON,it will reduce friction and sliding smoothly. WIDE APPLICABILITY : Sliding barn door kit is suitable for many life scenes such as bedroom,living room,study room,etc.There are also many people who choose to use it outdoors.If you want to do this,please pay attention to maintenance.(the barn door panel is not included) DETAILED SIZE : The sliding door kit for double door.Max weight capacity: 150 kg;Roller diameter: 69.9 mm;Sliding rail thickness: 5.8 mm,Sliding rail width: 39.9 mm.Applicable door panel thickness: 35-45 mm;Applicable door maximum panel width: 624 mm. AFTER-SALES SERVICE : We promise to guarantee the quality within 3 years after purchase, please rest assured to buy.If there is any problem, please contact us at first.We will reply you within 8 hours and solve the problem for you until you are satisfied., Weight: 330.693393 pounds, Manufacturer: Haccer