Orion 10103 1/4-Inch-20 Adapter for EQ1 Telescope Mount Provides threaded post for attaching instruments equipped with a 1/4"-20 threaded socket Installs securely onto mount head of Orion EQ-1 equatorial mounts Vital accessory for obtaining star-trail photos with your EQ-1 mount and a camera Useful for attaching spotting scopes to the EQ-1 equatorial mount Knurled wheel makes it easy to attach and detach 1/4"-20 equipped instruments