[STURDY STEEL BRACKET, UPGRADED ROUND CORNERS]- Fine black powder coated barn door bottom roller guide is tough, durable and rustproof, flush with the floor/ground, no screws protrude from the bottom, no groove required for door, no drilling on the floor. Perfectly shaped with round corners, countersunk holes and recessed screw heads, this wall guide keep children and toes safe from the hurts. [EASILY MOUNTED FOR MANY APPLICATION]- heavy stay roller door guide can be fixed/installed to the wall with screws, low profile sliding gate rollers looks great both indoors /outdoors for area such as living rooms or DIY project such as carpet on concrete slab, works perfect for keeping the door/gate lined to the wall; comes with step by step instructions, very easy to assemble. [SMOOTH & QUIET, GLIDE LIKE BUTTER]- Our bottom adjustable roller wheels contain built-in ball bearings, provide a smooth and effortless rolling, and not like others that have big wheels, only two small bearings, keep the door balanced and stable from both sides, just need small space to install, offer more wiggle room for perfect alignment of rollers with the door. [ADJUSTABLE ROLLER POSITION] Fully adjustable for different thickness barn doors, suitable door thickness can be up to 2-13/16 inch when using 2 rollers, up to 3-5/8 inch with inside roller removed. By adjusting the position of the rollers in the track to fit your door panel, fit most closet pocket doors.