This high-quality set of two wheels with a 4" diameter is designed for use with the Advance brand of cleaning equipment, specifically the Nilfisk AX 650 Aquamax, CMAX-20 Condor, CS7000, and SC6500 models. These wheels are a perfect replacement for damaged or worn-out wheels and are made from durable materials to ensure they last for a long time. Whether you're a commercial cleaner or a janitorial supply business, these wheels are a must-have item in your inventory. They're easy to install and will help keep your cleaning equipment in top condition, ensuring your cleaning tasks are completed efficiently. Upgrade your cleaning equipment today with this set of high-quality wheels from Advance.