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 Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!