MATERIALS: The rolling gate wheel is made of 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 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.