Pack of 2 high-quality assembly ring diameter: 25 mm to 21 mm railRef: m51616220 Material: Metal Weight: 86g Diameter: 25 mm Height: 55 mm/5.5 cm, Width: 45 mm/4.5 cm Features: Mounting Ring allows you to attach and raise a rifle scope. Quick and easy to open thanks to its screw. Can be used on all 21 mm (Picatinny) rails in your replicas. Complete with their PCs awl tool key.