Talley Scope Mount/Ring Combo features a 40mm tube diameter and 1.29 centerline height, measured from the top of the Picatinny rail to the centerline of the scope tube. Classified as high profile, this 8 oz 1-piece system is specifically engineered to mount Swarovski dS 40mm riflescopes onto rifles equipped with MIL-STD 1913 Picatinny rails. Constructed from aluminum with a black anodized finish, it includes mounting hardware. Safety Note Always ensure the firearm is unloaded before installing or adjusting any optics or bases. Verify proper torque specifications during installation. Improper mounting may affect accuracy and safety.