It's hard to imagine an easier way to mount a flashlight on a weapon—simply clamp your light inside the Olight Magnetic Weapon Mount, then snap it onto the barrel. Three strong N50 magnets hold the mount in place, round after round. The aluminum mount accepts flashlights with a diameter of 23-26mm (approximately 1"). A thumbscrew tightens the clamp that holds the light, while a knurled dial adjusts the mount to fit properly on different sized barrels.