CastersHigh-quality 2-inch crib rubber wheels with U-bracket, humanised brake design, improved metal connections, suitable for wooden boards with 20/22/25 mm, safer and stronger. Injecting a safety guarantee for your baby's growth. Plywood rollers roll easily on hard carpet floors and can be used for light furniture, cots, playpens and small tables. Technical data: Name: crib rollers, cot accessories Material: Rubber Load capacity: 100 kg (4). Wheel diameter: 47 mm. Installation height: 66 mm. Inner hole height: 23 mm. Inner width of the rail: 20/22/25 mm (0.8/0.9/1.0 inches). Package includes: 4 x rolls, screws. Tip: 1. Due to the difference between different monitors, the picture may not reflect the actual style of the item. 2. Please allow 1-2 mm error due to manual measurement. 3. Welcome to our shop! Our goal is to provide our customers with the best products and services. If you have any questions, please feel free to contact us. We will serve you within 12 hours and offer you the best and most satisfactory solution!