FEATURES-30mm-Black-Lightweight skeletonized aluminum body & caps to reduce overall weight without sacrificing reliability-#8 Torx style fasteners with steel threaded inserts to prevent stripping-Additional 1" cantilever forward design to provide additional eye relief-Places your optic at the ideal height for MSR & similar platforms-Dual 1/2″ tactical nut attachment 65 in/lb. of torque is recommended