Warne CZ PA 1in Med Scope Ring - Matte Black - Designed to fit the 19mm 550/557 and the 16mm 527 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. Features Permanently Attaches To Firearm's Dovetail CZ Specific Recoil Pin For Positive Engagement Of Ring To Receiver Dovetail Rings Securely Mount Around Scope Using 4 Torx Style T-15 Socket Cap Screws