LIBEROLL Heavy Duty Gate Caster 10cm (4 Inches) Rubber Wheel | Spring Loaded Swivel Caster for Wooden Gates, 113kg (250LBS) Load Capacity

• Built-in spring: The unique built-in spring design not only prevents sand and stones from entering the spring and causing damage and scratches, but also reduces the impact of rain and sunlight on the spring, thereby extending the service life of the spring.
• Absorbing impact force: The extension length of the spring can reach 1.73 inches, which helps it effectively support the door body and evenly distribute the load on the door. At the same time, it enables the wheels to move smoothly on uneven ground. Please note that it cannot be used in some very deep holes or extremely uneven surfaces.
• Note: To prevent the door panel from becoming suspended when the door wheel encounters a concave surface, it is necessary to compress the spring of the door wheel in advance during installation. This way, when the door wheel moves onto the concave surface, it can ensure that the door wheel can support the door body.
• Stable structure: The sturdy structure is achieved by combining thick-gauge galvanized steel brackets with high-quality rubber wheels. This brake-equipped door wheel can perfectly support a door or fence weighing up to 250 pounds per wheel. The ball bearings in this door wheel allow you to easily adjust the direction of movement.
• Package contents: This package contains 1 spring-type door wheel, 2pcs 90mm*M8 bolts, 2pcs M8 nuts and 2pcs washers. Installation instructions can be found in the pictures.

• Ensure your wooden gate is structurally sound to support the caster. Clear the intended path for the gate to ensure it is free of major obstructions. Measure and mark the desired mounting location on the bottom edge of the gate. — Prepare the Gate and Surface
• Align the caster's mounting plate with your marked location. Compress the spring mechanism slightly and insert the provided M8 bolts through the plate and gate. Secure with M8 nuts and washers on the other side, ensuring a tight fit. — Install the Caster
• Gently move the gate to test the caster's movement. Ensure it rolls smoothly and supports the gate's weight. Adjust the gate's height if necessary to ensure the caster is properly engaged and supporting the door body, especially when encountering slight inclines or declines. — Test and Adjust

Typical situations where LIBEROLL Heavy Duty Gate Caster 10cm (4 Inches) Rubber Wheel | Spring Loaded Swivel Caster for Wooden Gates helps — illustrative scenarios, not customer reviews.