Even Nitto's smallest parts are done right. This small piece of stainless steel seems pretty nondescript, but it’s one of the few rack mounted lamp holders that is stiff enough to properly do the job. Mount even a beefy light like the Sinewave Beacon off the Nitto Lamp holder, and you’ll get narry a jiggle out of it. Comes with a draw bolt for easy mounting on a Mark’s rack. You generally need some aluminum spacers and a longish stainless bolt and locknut to complete the light mounting, let us know what you are mounting to and what kind of light you are using, and we’ll get you the right stuff. Right hand side mount (makes for shorter wire runs to the hub, and if your light is bright enough, right side mounting has no negative affects).