XIANQI MaterialSolid carbon steel small guide rail,sub black powder coating,corrosion and rust resistance.How to useIf your door is thicker than 1.4",the bottom of the door have to be slotted.The thickness of the door is less than or equal to 1.4",and the door does don't have to be slotted.Safety and worryAfter the sliding door bottom bracket is installed,there are no protruding and bulky parts.will not hurt your toes,children and pets.Easy installationFix on the wall with screws,adjust the bottom screw to fit slotted or non slotted doors.Wide useThe door guide rail makes your door slide smoothly.used for sliding barn doors,bedroom doors,kitchen doors,fitting rooms,cabin doors.Product specifications:Material: Carbon steelSurface treatment: Matte BlackProduct size: 1.8" L x 1.5" WThickness: 0.13 inch Installation method: screw fixedNumber of mounting holes: 2 holesPackage Contents:2Pcs x U-Door Guide2Pcs x 1.55" Screws/Black2Pcs x 1.57" Wall anchorsProduct features:The barn door Guide are designed with a flat bottom,It will not damage your floor.The small guide rail has no extra parts protruding,It is safe and worry free,and does not kick your toes.