Weaver Tactical Precision Rings Matte Black 34mm X-High Precision machined 7075-T6 aluminum construction;Heavy-duty integral cross bolt for mechanical lockup;Type III hardcoat anodized finish;Durable Torx head cap screws;Compatible with Picatinny rails and bases;Available in 30 mm and 34 mm diameters;Offered in multiple 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