APPLICATION Suitable for steering wheels with an internal diameter ranging from 170mm-250mm, and 10.5" (270mm) to 13.4" (340mm), making it versatile for use with a wide range of vehicles. A must have for a diverse automotive workshop. FUNCTION Used to level the steering wheel accurately during any front end alignment procedure. Helps hold steering wheel in level position ensuring it is perfectly horizontal before proceeding with wheel alignment procedures. EASY INSTALLATION .