The Exposure Lights Helmet Mount is a sturdy threaded mount that's designed to secure your compatible Exposure Light to your helmet. All that is required is a vent hole in the helmet, as the mount has built-in washers on top and bottom. You simply screw it together, clamping the ribs aside the vent hole between the two pieces. The top of the mount has a C-shaped clip that snaps securely around the body of the Diablo, Joystick, or Spark light housing. It contains a ball joint that gives you a degree of positional freedom to aim the light. Exposure Lights have a two year warranty against defects in materials and workmanship.