Adjustable design: The distance between the two rollers can be set to match your door. After adjusting, tighten the screw and it will operate smoothly and quietly. quality: Heavyduty steel and nylon floor guide for strength and durability. The roller is made of POM with a builtin silencing design to reduce sliding noise. Specifications: Length 11.3 cm; Width 3 cm; Roller gap 6 cm; Suitable door thickness 2.5 cm to 6 cm. Easy installation: Mount to the wall with screws. No groove in the door is required. Adjust the roller position along the track to fit your door panel. No floor drilling needed. Suitable for indoor or outdoor use. Practical use scenarios: Interior sliding doors such as wardrobes, room dividers, or pantry doors. Exterior sheds or patio enclosures where a discreet floor guide is desired. Any lightweight to mediumduty sliding door system that benefits from quiet, smooth operation.