This plate is made by Astro-Physics and can be used with a variety of mounts. If you already own the 13.5" male Losmandy D series plates, this is the dovetail for you. The knob assembly features a brass pin with a tapered end to hold your sliding bar firmly with Mounting plate
400, 600E, 900 or 1200 German equatorial mounts (all models). All Takahashi mounts with the 2-hole mounting pattern (EM-10, EM-200, Teegul, etc) - use the Q4044 adapter plate.
This dovetail plate cannot be used as an accessory plate. However if you use Astro-Physics rings or rings from Parallax Instrument (with the Astro-Physics hole pattern), you can attach the same Losmandy D series dovetail to the top of the rings to use as an accessory plate.