ADJUSTABLE GUIDES TO FIT INTERIOR & EXTERIOR DOORS with widths from 1.5" to 3" INCHES! EXCELLENT QUALITY with Heavy duty steel bracket. The big roller and 2 small rollers can be disassembled separately to fit your door thickness. To keep your door slide quietly, all rollers use excellent POM material.MostrolGUARANTEES A SMOOTH SLIDE - We are using real bearings in our bottom guide, so you can enjoy a quiet and smooth slide every time. Also, the roller guide is fully adjustable, so you can use it with almost all of barn door.EASY TO USE - Mount to the wall with screws, and no groove required for door. By adjusting the position of the roller in the track to fit your door panel. No need to drill holes in the floor and it looks great both indoors and outdoors.HASSLE-FREE INSTALLATION - Ours is a complete package, and SO EASY to install and assemble. This is the only all-in-1 sliding guide that you'll ever need.FLAT BOTTOM DESIGN - Flush bottom design allows door needn't grooved and do not destroy your beautiful floor.Durable and working smooth for maximum efficiency and quiet.Mostrol