Product Description 1. Function: Designed to install wheel bearing cups in many heavy-duty axles, it is most versatile tool that can replace more than 30 individual drivers. 2. Fitment: Fits for heavy-duty axles with 11000 to 50000lb capacity (5 1/2 to 25 tons). The locking jaws can be adjusted to fit 3-5/8″ to 6-1/2″ OD bearing cups. 3. High Quality: Made of premium quality steel with solid construction to ensure a trusted performance, black powder coated at surface to ensure rust and corrosion resistance, this tool can absolutely fit your needs and service for many years. .