Arex Delta Gen 2 aluminum optic plate designed by Calculated Kinetics is a key upgrade to ensure reliability and safely securing your optic to the weapon. The Type 2 plate is compatible with Trijicon (RMR,SRO), Holosun (407C,507C,508T), Vector Optics Frenzy 1x22x26 MOS, and Swampfox (Justice 1x27, Liberty 1x22, Kingslayer 1x22). ALL HARDWARE, ALLEN KEY, AND VIBRATITE come with each order.