This Vixen size mounting rail has two wide slots for mounting screws that are either 1/4-20 or 6 mm in size. Works well as a mounting rail or as a top mounting rail for guidescopes if your rings are spaced between 1" and 4-1/4" apart. Made of aluminum, black anodized and has a 1/4-20 threaded hole in the center.
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Used this to put my Stellarvue 80mm apo on my Celestron Evolution mount. It works great. BUT you will need minor mods. This rail is short end the Evolution mount is wide enough that it does not let the rail go in fully. What you need are 2 plastic spacers about 3/8 long and longer bolts, either 3/4, 5/8, or what I used 1”. I needed the washers/spacers that came with the rail for the 1” bolts. The spacers and washers go between the rail and the clamp they are screwed into, adding space between the rail and clamps.