Package Dimensions:19 x 13 x 8.2 cm; 1.25 Kilograms Material:Alloy Steel, Metal, Rubber Plug profile:Door Mount Special Features:Retractable Batteries included?:No Batteries Required?:No Item Weight:1.25 kg Material: Rubber + steel Weight: Approx.1040g / 36.5oz Caster Dia.: 100mm / 4inches Load capacity: Max.100kg/ 220lbs Mounting Height: 24.5cm Retractable Height:4.39cm Features: About this item [Spring Loaded Design]: Our door caster adopts advanced spring-loaded design, which can automatically adjust the height on uneven ground, reducing the friction with the ground, slow down the rate of aging of the spring, extend the life of the door wheel, and reducing noise! [Shock Absorption and Brake]: Heavy duty 4 inch rubber wheels have strong load capacity, reduce noise, 360 rotation in all directions, easy to move and roll, and easy to open and close. The door is fixed with a brake function. [Strong Load-bearing Capacity]: Our spring loaded gate wheel is made of high-quality metal and rubber materials, it offers a strong load-bearing capacity, a maximum load of 220lbs. [360Swivel Caster Wheel]: 4 inches ageing resistance rubber caster with 360rotation top plate, great in mechanical strength and loading capacity, easily transform to any directions that you want, enable you spend little strength to move gate safely [Easy Installation]: Heavy-duty universal mounting plate with 3 holes for easy attachment to wooden doors or along the horizontal or vertical guides of a tubular gate, fits perfectly and runs well. It is the perfect heavy duty gate wheel for your daily life. See more product details [Spring Loaded Design]: Our door caster adopts advanced spring-loaded design, which can automatically adjust the height on uneven ground, reducing the friction with the ground, slow down the rate of aging of the spring, extend the life of the door wheel, and reducing noise! [Shock Absorption and Brake]: Heavy duty 4 inch rubber wheels have strong load capacity, reduce noise, 360 rotation in all directions, easy to move and roll, and easy to open and close. The door is fixed with a brake function. [Strong Load-bearing Capacity]: Our spring loaded gate wheel is made of high-quality metal and rubber materials, it offers a strong load-bearing capacity, a maximum load of 220lbs. [360Swivel Caster Wheel]: 4 inches ageing resistance rubber caster with 360rotation top plate, great in mechanical strength and loading capacity, easily transform to any directions that you want, enable you spend little strength to move gate safely [Easy Installation]: Heavy-duty universal mounting plate with 3 holes for easy attachment to wooden doors or along the horizontal or vertical guides of a tubular gate, fits perfectly and runs well. It is the perfect heavy duty gate wheel for your daily life.