Feature 0 MOA Type, AR Platform Tactical Picatinny Mount, Four Screws Per Ring 38mm 1.5in Bottom to Ring Center, Extremely Accurate w/ Full CNC Machined Light Weight, 21mm Picatinny Mount with Two Crossing Bolts & Anti-Retreat Bar Specification Specification Details Ring Dia: 30 mm Height: 62 mm / 2.4 in Central Height: 38 mm / 1.5 in (Bottom to Center) Length: 139 mm / 5.5 in Material: 6061 - T6 Aluminum Alloy Weight: 155 g / 5.5 oz Mount: Picatinny Finish: Coyote FDE Items in the Package: T15 Torx Wrench, Retail Package Relations