HellFighter X-8 LED Module Bright 135 Lumens - LED Kit includes Flag Switch 6-inch and Gooseneck Mount Perfect for the AR Platform Length: 5.75 inches x 1.5 inches, Body Diameter: 1 inch, Weight: 6.5 ounces, Powered by (2) cr123 lithium batteries - included Lifetime Warranty (excludes bulbs and batteries)