Bimini Tube Mount Light 12V
A great innovation for those needing a rail mount light that neatly conforms to tubing from 25mm to 50mm diameter. They even incorporate a small waterproof push button on-off switch (rated IP65 waterproof rating). Many use these on bimini rails - handrails, even roll bars.
100mm long x 30mm wide x 13mm deep (depth without mounting bracket.)