Standard aluminium mount plate with a range of hole pitches for a good balanced setup and for the main scope which normally comes fitted with a dovetail bar for fitting to a mount.
Female dovetail unit again which is screwed to the plate at the other end in any pair of a range of holes, again to allow a well balanced setup. Fitted below and along the centerline is another dovetail bar to fit the whole assembly onto your mount. The dovetail bars are for the vixen type Mount ie EQ6, HEQ5 etc.
Losmandy G11 and Altair D6 plate