The iOptron Binocular Adapter allows you to quickly and easily use your large astronomical binoculars on their AZ Mount Pro head, so you can enjoy comfortable wide-field views of the sky all night long with full GoTo and tracking capability. The adapter is comprised of multiple parts including a dovetail plate for your binoculars, a matching saddle to mount your optic onto the adapter, a connecting bolt for the mount head, and a 20mm diameter counterbalance shaft. Most large astro binoculars come with a center bar and an integrated tripod adapter which will allow it to attach directly on the dovetail plate. If it doesn't have an integrated tripod mount you may need to also get a separate binocular tripod adapter. This is just the adapter—you need to supply the mount, binoculars, and weights.