Review on 2PCS CZC AUTO License Plate Light Bulb - 12V White LED Lamp, Waterproof/Rainproof, Black Aluminium Holder - Legal for Car Motorcycle Truck RV ATV Bike by Michael Lucas

First off these lights appear to be very well made, I love everything about them EXCEPT the length of the threaded rod to screw on. My trailer has a fairly thick metal rail, plus a number plate and a decorative frame to protect the number plate. The overall length of the stem is no more than 5/8" bringing it almost to the level of the inner face where I have yet to tighten the nut. :-(Again, I think these are really cool lights, especially on one like this reasonable price, for me, although I will now try to drill into the back of the frame to try and make a recess that will allow the use of nuts and hopefully a lock washer!