SureFire M Series Scout Light, LED WeaponLights with TIR Lens and Tumbscrew MountHigh performance, recoil proof LED generates 350 lumen white light and 120mW IR LEDs regulated to maximize light output and runtime Total Internal Reflection (TIR) lens creates intense, versatile beam with enough reach for longer range applications and significant surround light for peripheral vision Mounting system: Integral thumbscrew clamp for MIL STD 1913 (Picatinny) rails Construction: Mil Spec hard anodized aerospace aluminum, optically coated