34 mm Scope Rings for CZ 550/CZ 557 Low Aluminum by CZ USA Product Overview now offers the 34 mm Scope Rings for CZ 550/CZ 557 Low Aluminum. The 34mm Rings are constructed from high strength and heat treated aluminum. The Scope Rings are finished with Black Oxide to prevent corrosion and resist damage. The Scope Rings are low height and will support scopes with an objective up to 35mm on most firearms. You should always check the clearance of the scope to barrel prior to final installation of any scope rings. Specifications and Features: For CZ 550/557 Steel Construction Low Height Up to 35mm Scope