American Defense Manufacturing AD-Delta-C Scope Mount Standard Lever Black 30mm AD-DELTA-C 30 STD. Top rail to scope center line height is 1.5 for 30mm Rings. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec Specifications for American Defense Manufacturing AD-Delta-C Scope Mount: Manufacturer: American Defense Manufacturing Fabric/Material: 6061-T6 Aluminum Color: Black Tube Diameter: 30 mm Additional Features: Standard Lever Finish: T3 Mil-Spec Anodize Package Contents: American Defense Manufacturing AD-Delta-C Scope Mount American Defense Manufacturing AD-DELTA-C 30 STD: AD-Delta-C Scope Mount Standard Lever Black 30mm