I have had a set of no-name brand of flood lights flush mounted in holes cut in my Jeep rear bumper that I use as auxiliary to backup lights. In the back they are also are effective as work lights.I got these Nilights to replace those cheaper brand since I was getting condensation in one.Now for my use, these Nilights were not great. The Nilights are better quality all around, from internals to finish. These are part of the "Nilight Pro" line and very high quality. But this model pair are very narrow spot lights and hence not great for aux reverse, and certainly not for auxiliary reverse on an off road trail or overlanding. As in those cases you are backing very slowly and want a broad/flood type light. In reverse you don't need the kind of spotlight reach one would want as a supplement to headlights for going forward direction at 40mph. Also the narrow beam is not very amenable to use as a work light.Nilight makes mostly combination flood and spot, but this is just spot.So these are best if used in front for spot driving lights for longer reach, or its nifty driving lights feature, and where a flush mount works. Since they are not inherently adjustable, and you want spots to be able to be adjustable to even fine amounts of degree, I suggest if you cannot get behind easily for nuts and bolts and washers, that you do not use pop-rivets as fasteners. Instead use riv-nuts. By using accusable bolts or riv-nuts you can loosen and then shim with slim pieces of plastic from something, between the faceplate and the bumper or other mounting surface and rough and fine tune aim of these.I did not check electro-magnetic interference (EMI) since I just rough fit these in existing identical hole to see the spot and put 12 volts in from my hitch harness to check beam. But Nilight in generally, and especially its "Pro" line are known to not generate interference into your radio or other lights as some other brand LED pods and bars do. With these you get full kit for flush mount including stencils, bolts (again if access to rear of mount area is difficult, use riv-nuts) and harness. These also have nifty driving lights integrated (hence the three leads).