Feature 1 Elevation Height: 35-41mm / 1, Suited Different Objective Lens 2 Value Can be Adjusted Smoothly, Accurately Compensate for Bullet Drop three Mounting Cross Bolts Per Ring, Ultra-strong & Stable, Fit Picatinny and Weaver Mount 4 Cantilever Mounting Solutions Give You Optimal Eye Relief and Rail Space five Precision Machined from Rugged Aluminum Alloy, Stable and Durable Rings Specification Ring Dia: 30 mm Adjustable Elevation Height: 35-41 mm / 1 -1 in Material: 6061-T6 Aluminum Alloy Mount: Picatinny and Weaver Finish: Matte Black Items in the Package: 1 notebook computer T15 Torx Wrench