Specifications: Heavy-duty spring gate casters can be adjusted according to the surrounding terrain to maintain the height of the doorway throughout the opening and closing cycle It has a rated load of 60kg and a spring clip. When the caster rolls on a rough or uneven surface, the spring clip can act as a shock absorber. It also has a universal bracket for wooden or metal doors. Item Name: Door Wheel Material: Rubber, Steel Bearing: Double Shaft Specification: 4 inch Spring Wheel for Door Maximum Load: 60kg Features: Shock-absorbing, 60kg Load Capacity, Home Roller Slider Size: 28cm x 10cm x 5cm/11.02" x 3.94" x 1.97" (Approx.) Installation Height: 280mm/11.02" (Approx.) Wheel Diameter: 100mm/3.94" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Door Wheel