The Nightstick TWM-850XL Xtreme lumens tactical weapon mounted light uses a cree LED rated 850 lumens working in conjunction with a high efficiency deep parabolic reactor to reate a usable beam of light rated at 245 meters. This weapon light features a unique and completely ambidextrous dual dependent toggle switch on each side of the light to operate the momentary-on and constant-on lighting modes. The housing of the TWM-850XL is constructed from Aircraft grade 6061-T6 aluminum with a glass-filled nylon polymer battery door and toggle switches. Includes 4 sets of cross-rail inserts.