Dovetail Groove Style Dovetail Rail Suitable for installing guide scopes, ZWO boxes, finderscopes and other accessories on Celestron 8SE / Evolution 8 / C8 / C8HD / Evolution 9 / C925 / C925HD / C11 / C11HD main scopes. It can also be used as a handle. Multiple rail colors including red, black and orange are available. Versatile Uses, Assemble at Will The rail can be used to install various devices such as guide scopes, boxes, finderscopes, etc. as needed.