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.