• Made From ABS Plastic
• LED Light
• Provides 100 hours of light on (3) "AAA" Batteries
• Adjusts for 1-1/2" to 1-13/16" diameter Rail cages.
• No wiring required.
• Installs in minutes.

Also, works great as a cargo bed light.  There is a set screw in the plastic housing that lets you adjust the angle of the light.