GM-8 saddle on one side 1/4-20 bolt and (2) aligning holes on other side. Main scope in saddle GM 8 90 mm 108 mm or 125 mm guidescope rings on other. GM-8 saddle plate can be mounted to other side to make a side by side system. Wt. 2 lbs. Total thickness 1.0. Separation 8.0 center to center.
