4 Inch Heavy Duty Rubber Belt Spring Loaded Gate Door Wheel Caster Home Gate Door RollerMaterial: Metal and rubber. The 4-inch gate roller with adjustable spring mount is designed to allow gates to open and close freely. It has a load capacity of 50-60 kg and a spring-loaded clamp that acts as a shock absorber when the roller rolls over rough or uneven surfaces. It also has a universal mount for wood or metal gates.Heavy-duty spring-loaded gate rollers adjust with surrounding terrain to maintain gate height throughout the opening and closing cycles. These rotating supports work equally well on even and uneven surfaces such as asphalt, brick, concrete, soil, grass, gravel, and paving stones.Color: BlackSize: 10 cmDelivery quantity: 1 pieceWhen shopping, please pay attention to the product's size and dimensions to ensure that it meets your needs. In the title and description, 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 do not 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.