X-ACCU 30mm Adjustable Elevation Dovetail Rings Model: XASR-3045 30mm Diameter, Adjustable Elevation Height From 35 to 41mm (1'' Bottom to Ring Center) 6 Torx Screws Per Ring, Can Fit 56mm Objective Lens Scope, CNC Well Machined, Dovetail X-ACCU 30mm Adjustable Elevation Picatinny Rings Model: XASR-3040 30mm Diameter, Adjustable Elevation Height From 32 to 38mm (1'' Bottom to Ring Center) 6 Torx Screws Per Ring, Can Fit 56mm Objective Lens Scope, CNC Well Machined, 1913 Picatinny