UTG Picatinny Style QD Lever Lock Integral Offset Mount– 1″ w/2 Picatinny Slots on Top Rings, Fully Adjustable for Most Secured Lock, 35mm Mount Clearance,70mm Base, 20mm Saddle Height, See-Thru, Fits Scopes up to 65mm Obj. Dia., 8 Top Screws. For forward offset position (see application 1), the outside diameter of the objective bell of the scope shall be less than 65mm. For reverse offset position (see application 2), if the scope front tube length (“D” as in following scope diagram) is less than the mount base of 100mm. then the outside diameter of the scope objective bell shall be less than 47.5mm.