Provides a platform for coupling telescope to optical tubes Dovetail plates are made of extruded, anodized aluminum. Includes four optical axis offset adjustment screws Available in two lengths: #7383 is 8" and #7385 is 13" The 13" Orion Dovetail Mounting Plates provide a platform for coupling telescope optical tubes to Orion SkyView Pro and Atlas mounts and also the Sky-Watcher EQ5, HEQ5, HEQ5 PRO, EQ6 and EQ6 PRO equatorial mounts. Tube rings (sold separately) bolt on to the dovetail plate, which then fits into the dovetail slot on the equatorial head. Dovetail plates are made of extruded, anodized aluminum. Length: 13"