Leapers 30mm Rings, High, 3/8" Dovetail Mount Type: 3/8" dovetail mount High Profile 30mm Tube Diameter rings Center Height: 36 mm / 1.42 in Max Fit Obj. Bell Dia: 71 mm / 2.80 in Ring Width: 21 mm / 0.83 in Saddle Height: 21 mm / 0.83 in Material: Aircraft-grade aluminum Reversible Locking Plate 4 Hex Screws per ring Vertical stop pin Limited Lifetime Warranty Special tape inside the rings keeps your scope tight without excessive clamp pressure!