Floor Protection It is wrapped in soft polyurethane material to ensure there are no scratches or marks on the floor and easy to move. Stable Structure Diameter: 50mm. The swivel castor tires are made of sturdy hard rubber, the stable steel construction can transport objects up to 100 kg. (Up to 27 kg per roll) Thanks to the galvanized steel frame, the castors can easily be used both indoors and outdoors. Reinforced Design The L-shaped mounting plate saves space. space and is easy to install. The newly improved five mounting holes fix the guide 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 ApplicationsUsually used in small projects and moving furniture, including dressing tables, boxes, under cabinets, etc. the bed, shoe cabinets, toy chests, cabinets, bookshelves, easels, etc. What You Get2 x swivel castors with brake, 2 x castors without brake