Alcoa One-Piece Front Hub Cover System for 10-Lug 285.75mm bolt circle, 22.5" and 24.5" hub piloted wheels, they also work for the wide base 9” & 12.25” float wheels. Made from High Grade Chrome ABS Plastic, this kit is perfect for all steer applications. Use a short handle rubber mallet for application. Maximum stud standout 2.50". Designed specifically for aluminum wheels. Wheel covering accessories help protect the rig and help it shine. These are easy to install and look great.