The new Pro Dial Board Holder utilizes a thick, billet aluminum construction to withstand harsh vibration. The design is simple, yet immaculate. The board mounts to the chassis tube (not the fire wall) and swivels across the spring loaded wave disc. This can be located by hand without any tools, yet stays located while the car goes down the track. Dial board included. Offered in polished or a Black Anodized finish. You also have the choice between 1 1/8", 3", and firewall mounting solutions.