Fits the TARS� 3-15x50 (34mm tube) Riflescopes. - Heavy Duty Steel Rings are constructed of high strength steel with a Parkerized finish. 1/2 hex nut and six torque drive screws per cap. Fits on 1913 Picatinny style rails. Built to hold the heaviest scope on those earth shaking big bore rifles. - Weight = 13.4 oz. - Height of Mount Surface to Optical Axis = 1.711 in.