Vism 30mm Riflescope Rings mounts onto Weaver, Picatinny and MIL-STD 1913 type rails. These Vism Rings are sold in pairs and features a 30mm scope tube diameter ring with removable 1" inserts . The Vism Rifle Scope 30mm Rings are made of black anodized aluminum and the mounting tool is included.Features: New Hunter Series of Scope Rings. 30mm Scope tube diameter ring with removable 1" inserts Mounts onto Weaver/ Picatinny/ MIL-STD 1913 type rails Hexagon Shape mounting nut, with holes for torquing with Allan key wrench Black Anodized Aluminum Construction Rings sold as a PairSpecifications: Tube Diameter: 30 mm Color: Black