Warne 1" PA CZ 527 Rifle Scope Mounting Rings 16mm Dovetail Medium are designed to be the strongest, most durable Fixed Scope Rings system available. Typical steel RifleScope Rings in this class use only 2 screws per ring, have a narrower clamping band and in most cases only absorb recoil in the front ring. Maxima PA Scope rings utilize 4 T-15 Torx style socket cap screws for secure RifleScope optics mounting. The Maxima PA series fit Weaver style cross slot bases and incorporate a Warne square stainless steel recoil control key in both the front and rear Scope Mounting rings.