8 Ball Bearings: Compatible with Polaris 180 and 280 cleaners and replace part number C60 C-60. 4 x Wheel Bolts: This wheel bolt replaces quantity number C-55 C55, compatible with Polaris Cleaner 180 and 280 Premium Quality: Stainless steel and plastic ball combination bearings, corrosion-resistant materials, comparable to the bearing part, ensure smooth rotation and operation of the wheel. Before installation, please wear rubber gloves to ensure the safety of your hands. You don't need any tools, just connect the wheel axle to the cleaner wheel. Please confirm if it matches your machine model so that you can use it better.