Dual Ring Scope Mount 20mm Rail 25.4mm 30mm Dual Ring Cantilever Heavy Duty Scope Mount Anti Cant Cantilever Scope Mount Picatinny Top of scope rings feature a short Mil-Spec accessory 21mm width rail, that will fit most any standard Picatinny/Weaver style rail and scope mount. Easy and quick install and removal. Designed as a Locking Quick Detach Release Lever Mount with dual scope rings for mounting optics quickly and securely . Internal Diameter is 30mm and includes... The mount base with full adjustability would fit on standard 20mm Weaver Picatinny Rails. Hexagon Shape mounting nut, with holes for torquing with an allen key wrench. TriRock Quick Detach Release 25.4mm 30mm Dual Rings Scope Finished by :Black Matte anodized Material: 6061-T6 Aluminum Fits Rail Width : 0., 78 inch (20mm) Diameter: inside 0., 98inch(25mm) outer ring 1., 18inch(30mm) Net Weight: 195g Gross Weight:242g Package Includes: One set of Scope dual rings cantilever mount One piece of Wrench TRIROCK Scope ounting Rings with Bubble Level, Dual ount Adapter Ring...