Weaver Precision Rings Matte Black 30mm X-High Precision machined from 7075-T6 aluminum;Integrated recoil lug for secure engagement and zero shift;Type III hardcoat anodized finish for enhanced durability;Lightweight, high-strength construction with a low-profile footprint;Durable Torx head cap screws;Compatible with Weaver and Picatinny-style rails and bases;Available in 1" and 30 mm diameters;Offered in multiple common height options;Made in the USAtable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 4000 Product Group Code: 4000C Product Sub Group 1: 4000C2 Inactive: No