The OPTEC-2400 circular dovetail mount is used for the TCF-S focuser and IFW filter wheel to allow easy connections from most any telescope. If your scope or accessory is not listed, do not hesitate to call. These adapters are required to fit the TCF-S and IFW 2-inch models to various telescopes. One end has the necessary fittings for the particular telescope and the other has a protruding ring with dovetail groove. The three #8-32 setscrews in the TCF-S or IFW clamp down on this ring. Adapters are also compatible with the TCF-S. Most mounts are made from high strength 6061 aluminum alloy and black anodized.