The Trijicon MRO� 1/3 Co-Witness Quick Release mount features a Mil-Spec drop test rated 7075-T6 aluminum design with a easy to use one handed tool less mounting. Return to Zero features in a low weight low profile design which works with any Picatinny rail. - Weight: 1.8 oz. - Length: 1.8 in. - Distance From Top of Mounting Rail to Optical Axis: 1.66 in. - Package Includes: - 1 Mount - 4 Screws - 1 Hex Key - 1 Installation Booklet