The ultimate in setup blocks for squaring your sprint car! These EZ Square Tools have adjustable blocks that quickly and securely mount to your car and cradle the axle, making it a breeze to set height and square. This IS the MUST HAVE setup tool for the series sprint car racer. The Optional (sold separate) Adjustable Rule Arms (pair) give you precise and quick setups all the time! Check out torsionbarrate.com for more info.