Features: 1.Application: Trailer arm anti collision block is used for towing caravans or motorhomes, (only for towing balls with 22mm thick wire rod). 2.Practical Accessory: Trailer arm anti collision block can prevent you from accidentally hitting the trailer arm. It is a safe and reliable accessory. 3.Premium Material: Made of premium rubber material, this block is flexible, wearproof, high temperature resistant, not easy to break. 4.Simple Operation: Trailer arm rubber block is simple to operate, no cutting or splicing, no complicated operations, convenient for using. 5.Long Use Life: Professional manufacturing, high performance, strong reliability, can be used for a long time, do not need to change frequently. Specification: Item Type: Trailer Arm Anti Collision Block_x000D_ Material: Rubber_x000D_ Hole Diameter: Approx. 22.7mm/0.89in_x000D_ Application: For towing caravans (only for towing balls with 22mm thick wire rod) Note: The diameter of the center hole is 22.7mm, so it is only applicable to the trailer ball with 22mm thick rod