The bcm gunfighter 1 inch light mount- KeyMod, version Mod 0 is for 1-inch diameter light bodies. Fully ambidextrous mounting; either the left or right side of the rail system and fits a majority of popular 1-inch round body Tactical light systems. Design to mount on the 1:30 or 10:30 o'clock (upper 45 degree) rail positions. Made from strong aluminum construction and intently designed to below-profile and snag-free.