HEAVY DUTY: The gate guide roller is made of solid galvanized steel and dual nylon rollers, galvanized for extra durability and weather protection,makes the roller durable to use.ADJUSTABLE DISTANCE: The width of the distance between the two rollers are from 15mm/0.59 to 60mm/2.36in. Please make sure the door width is less than 60mm/2.36in before ordering.EASY INSTALLATION: The sliding door hardware is bolted with 1/2" bolt, which is easy to install on the post wall.L-SHAPE BRACKET: The universal l-shape gate roller guide is compatible with all sliding gate types. which can be modified to face up or down.Prevents gate from falling off the tracks and enhances the performances.WIDE APPLICATION: L-Post bracket sliding door guide roller can be used for most types of sliding doors and fences.Great for your garden sliding gate, Yard fence. Enhances and prevents the slide gates from falling off the tracks