Aeroflow Performance billet battery hold down trays are now available to suit the popular optima batteries both red top and yellow tops. Machined from 6061 billet aluminium for strength our battery mount holds the battery firmly in place and provide a rigid base to mount to the vehicle. With a recessed bottom to lock the battery into place. Recess dimensions are 248 x 165mm. Overall (outside) dimensions are 310 x 178mm. *Not suitable for 27 or 31 series Optima batteries.