Strong, lightweight aluminum mounts provide a secure, solid platform for Trijicon's RMR(TM) red dot sights. RM33 provides a low-profile mount on Picatinny rails; attaches to rail with a full-length locking bar and two recessed hex-head set screws. Mount behind your primary optic for fast transition from a magnified view to close-in sighting by rotating the rifle slightly. Locking bar and easy-to-grasp grooved thumbscrew ensure fast attachment. Mfg: Trijicon SPECS: Aluminum, hardcoat anodized matte black. Heights measured from top of rail to bottom of sight. Fits Picatinny rails. RM33 - A 1/4" (6.4mm) high.