The Badger Ordnance Medium Unimounts are light weight due to both design and materials. By removing material without compromising strength and rigidity, the Unimount is an unparalleled scope mounting option. Billet machined from 6061 T6 Aluminum and Mil Spec Type III Hardcoat Anodized. Centerline Height .885?Ring Diameter: 30mmLength: 3.375?Weight: 4.6 oz. P/N 306-62 MAX-Alloy Badger Ordnance 30mm rings .885 Unit Mount 306-62