Orion 7382 Guide Scope Ring Mounting Bar Rigid anodized aluminum bar used for coupling guide scope rings to an astrophotography telescope Attach guide scope rings to this mounting bar, then attach bar in piggyback orientation to imaging telescope Multiple holes along length of mounting bar allow rings to be positioned for long-tube or short-tube guide scopes Pre-drilled holes allow easy attachment to Orion SkyView Pro, Sirius, and Atlas mounted telescopes with tube rings Astrophotography telescope must be equipped with tube rings in order to attach guide scope ring mounting bar