The Trijicon Cantilever Mount w/ Q-LOC(TM) Technology features a 34mm / 30mm tube, and is designed to keep the optic as low as possible for hunting and long range precision rifle applications. Featuring a Mil-Spec drop test rated 6061-T6 aluminum design and an easy to use one handed tool less mounting system. The spring-loaded design allows for constant retention and maintaining of zero even if the knobs are not tightened. The mount boasts a low weight and low profile design with superior return to zero performance and is compatible with any Mil-Spec or NATO Picatinny rail. Matte black anodized finish Made in the USA Distance From Top of Mounting Rail to Optica Mfg: Trijicon