Made in the U.S.A. of anodized 7075-T6 aluminum, this pair of Weaver 30mm Precision Tactical Riflescope Rings offers a secure and reliable mount for your 30mm maintube riflescope. The rings hold your scope at low mounting height, with an integrated cross bar ensuring the scope doesn't budge and the ring cap secured by four Torx screws. They Precision Tactical rings fit Picatinny and, naturally, Weaver mounting rails. Product Specifications Maintube Diameter: 30 mm Mounting: Picatinny / Weaver Quick Release: No Cap Screws: 4 (per Ring) Materials: Aluminum