Trijicon Ring Mounts w/ Q-LOC Technology feature a 30mm tube, and are 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 Ring mounts boast a low profile design with superior return to zero performance and are compatible with any Mil-Spec or NATO Picatinny rail.Features :Quick-Release, Return-To-ZeroAutomatic Retention Keeps Optic SecureSnag-Resistant Knob DesignPrecision-Cut DimensionsProven Durability30mmHeight - Extra High