Maxima Grooved Receiver Line of scope mounts are designed to fill the need of mounting scopes to rifles with an integrated receiver mounting rail. Because each manufacturer has their own proprietary mounting rail design, each ring model must be machined to exacting tolerances for proper fit and function. The Maxima Grooved Receiver line fulfills that need. The precision CNC machined Warne rings provide unsurpassed strength, durability and quality, and fit a variety of rifle models including CZ 527 (16mm dovetail) and CZ 550 (19mm dovetail) Receivers. Available in both Quick Detach (QD) and Fixed models for most CZ firearms. Mfg: Warne Mfg. Company SPECS: MIM Steel, powder coated black, matte. Height measured from top of base (or integral dovetail) to the inside bottom of ring.