Astro-Physics Astro-Physics 15" Ribbedn Mounting Plate for 900 Mount for all Astro-Physics refractors, except Traveler and 130EDFS.
This plate is 14.75" long, 7.75" at its widest point 5" at each end and 1" thick. The underside of the plate is carved into a ribbed pattern to maximize the strength and minimize the weight to a mere 3 lbs. A pair of keyhole slots that measure 3.2" between centers are provided at each end. The distance between the pairs is 13.75".