Astromania Dovetail Bar - fit the dovetail mounting base on most telescopes. The mounting bar has two M6 through-holes on both sides for easy adaption to rings. Three threaded through-holes: the center hole has ¼"-20 threads and the two larger holes on either side of center have M8 x 1.25 threads. Accepts all sights designed to fit a standard Picatinny rail. Fits into standard finder shoes by Skywatcher, GSO, Celestron, Vixen, Orion. Fits the dovetail mounting base on most telescopes. Machined of high quality aluminum and anodized black, durable for long time use.