The CZ-USA 40087 CZ Rings 457/455 30mm Matte Black Medium provides a precise, durable mounting solution for 11mm dovetail bases, crafted from lightweight aluminum with a 0.575 inch height to offer reliable headroom for typical optics on a variety of CZ rimfire and similar platforms. Built to accommodate 30mm optics, these rings combine a matte black finish with sturdy construction to resist recoil and maintain alignment between shots, ensuring repeatable accuracy in field or range use. The integrated 11mm dovetail base configuration simplifies installation and enhances compatibility with existing mounts while the medium height positions the optic for comfortable cheek weld and clear sight picture, helping shooters achieve fast target acquisition. Designed with a user-friendly profile, the rings deliver secure clamping and dependable zero retention, making them suitable for hunting, target shooting, and training scenarios where dependable optic support is essential. This mount pair leverages CZs trusted engineering to provide a balanced, low-profile solution that complements the feel and handling of CZ platforms while maintaining clean lines and smooth integration with compatible 30mm optics.