Floor Protection It is wrapped in soft polyurethane material to ensure that there are no scratches or marks on the floor, and it is easy to move. Stable Structure Diameter: 50mm. The swivel caster tire is made of solid hard rubber, and the stable steel structure can transport objects weighing up to 100 kg. (Up to 27 kg per roll) Due to the galvanized steel frame, the caster can be easily used indoors and outdoors. Reinforced design L-shaped mounting plate saves space. Large space and easy installation. The newly improved five mounting holes fix the rail in a horizontal direction and are not easy to deform. The corners are reinforced to make the mounting plate more stable. Wide Range of Applications Commonly used for small projects and mobile furniture, including dressers, boxes, under cabinets, etc. Beds, shoe cabinets, toy boxes, cabinets, bookshelves, easels, etc. You will get 2 swivel casters with brakes, 2 casters without brakes