1、Application: Trailer idler hub kit, 5 on 4.5 for 3500 lbs trailer axle, is suitable for 84 1‑3/8in to 1‑1/16in Cargo Boat Trailer Spindle. 2、Secure and Stable: Ensures the trailer remains stable and free from swaying or shaking during transportation, providing a safe and secure connection between the trailer and the towing vehicle. 3、High Load Carrying Capacity: Designed to bear high loads and pressures, these trailer hub kits are built to stably support the weight of the trailer, offering a safe and reliable towing experience. 4、Reliable Performance: The hub kit is built to ensure reliable durability, it undergoes strict quality control and testing processes, enabling them to withstand prolonged usage and various challenges. 5、Easy Installation: The trailer hub kits are designed for easy and hassle free installation, with necessary hardwares, making it convenient for users to set up their trailers.