Floor protection: It is wrapped in a soft polyurethane material to ensure that there are no scratches or marks on the floor, and it is easy to move. Security - Five horizontal mounting holes serve to fix the guide rail and are not easily deformed. The angle is enlarged to make the mounting plate more stable. Intimate L-shaped design mounting plate to save space and easy to install. The newly upgraded five fixing holes fix the guide rail in the horizontal direction and are not easily deformed. The corners are reinforced to make the mounting plate more stable. Strong and durable - Each wheel is equipped with high quality ball bearings. High load capacity: The load capacity of each wheel is 10 kg. Wide possibilities of uses: Generally used for small projects and mobile furniture, including dressing tables, boxes, storage spaces under the bed, shoe cabinets, toy boxes, cabinets, bookcases, easels, etc.