MATERIALS: The rolling gate wheel is made of high quality PU anti-corrosion steel, sturdy and durable, it has the characteristics of anti-oil, anti-corrosion and anti-rust DIMENSION: The total mounting height is 25.5cm; wheel diameter is 5cm; the mounting plate is 7.54.5cm (LW) LOAD CAPACITY: The maximum load capacity of each caster is 50 kg TOP DESIGN SPRING: The gates retractable wheel allows for 6cm of vertical movement, automatically adjusting the height on uneven ground to prevent it from sagging, while ensuring the gate stays in contact with the ground when you swing it open and close easily and smoothly EASY TO INSTALL: Comes with 4 bolts, sturdy universal mounting plate with 4 holes to fit wooden garden gate, driveway gate and at the yard fence When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''''''t hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it