Talley Lightweight Alloy Scope Mounts feature rigid, one-piece construction and a design which eliminates the possibility of a crooked interface between the base and the action, an issue which can affect two-piece designs. This feature provides added strength, enabling them to be stronger than steel rings and bases, but at a fraction of the weight. Extruded from 7000-series aliminum alloy, CNC-machined, and anodized for long-term resistance to the elements. Talley Silver 30mm Kimber 8400 Low Scope Rings S730840