HellFighter Flag Switch (12-inch) & Tail Cap (1-inch) for Weapon Mount X-8 Series Six points of contact-one can fail and the others continue to work Bright 135 lumens - LED Perfect for the AR Platform  Great handheld light 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)