These Warne Quick-Detachable Scope Ring Mounts are designed to fit 19mm CZ 550/557 integral dovetails. Warne's Maxima CZ rings are a solid steel, vertically split ring that handle even the most punishing recoil, or large, heavy scopes. Since each firearm manufacturer has their own proprietary mounting rail design, each ring model must be machined to exacting tolerances for proper fit and function. Because of this, the Warne CZ Rings are able to fit right onto the receiver's dovetail with no need for a mounting base. The CZ Quick Detach rings are available to fit the CZ 550 receiver design (19mm dovetail) and utilize 4 T-15 Torx style socket cap screws for secure and permanent optics mounting. FeaturesAttaches to firearm's dovetailReturn to Zero Guaranteed, quickly detach and reattach the Maxima QD rings with no loss of zeroCZ specific recoil key for positive engagement of ring to receiver dovetailRings securely mount around scope using 4 Torx style T-15 socket cap screws