Orion 7385 13-Inch Dovetail Mounting Plate Provides a platform for coupling telescope optical tubes to Orion AstroView, SkyView Pro, Sirius, and Atlas equatorial (EQ) telescope mounts Attach telescope tube rings (sold separately) to the dovetail mounting plate for easy, no-tools attachment of the telescope to an Orion EQ mount Thirteen inch long plate is especially useful for longer focal length reflector and refractor telescopes Made of extruded, anodized aluminum Includes four optical axis offset adjustment screws