Mako 100 Lumen LED 1-Inch Diameter Flashlight with Picatinny Mount Incorporates a built-in exceptionally secure QRrail clamp 1 inch diameter Mounts to any 1913Mil-StdPicatinnyrail Aerospace aluminum casing hard anodized - Mil Spec Output-378 lumen LED Comes with built in Picatinny mount LED assembly means no broken bulbs and over an hour of continuous illumination from one battery Ambidextrous push button activation Momentary or constant illumination Hard anodized to military specifications