For Astro-Physics 400, 600E, 900, 1100 and Mach1GTO Mounts
This machined aluminum mounting plate measures 15" x 4.6" x 0.5". Two keyhole slots that measure 3.2" between centers are provided at each end of the plate. The distance between these pairs of holes is 13.75". You can drill additional holes to suit your needs. The plate weighs 3.3 lb. (1.5 kg.).
If you plan to use an accessory plate on top of your rings, we suggest the 15" Dovetail Plate (DOVE15), if you have one. It is now discontinued. All Astro-Physics rings (except the Traveler and Stowaway) are pre-drilled to accept the DOVE15.
Fasteners listed on Mounting Plate Fastener Chart