For 30 years I have had snowmobile and watercraft and utility trailers with the hated rectangular plastic Wesbar style trailer lights that ALWAYS break. Step on them, they break. Touch them with anything, they break. Over a few years of heat and cold, they warp and break even without help. Never again! These Nilight's are protected by a steel box. If you are handy with tools and don't mind drilling a few holes, these can replace those flimsy old lights with the modern style oval shaped sealed lights. Very well made, very strong. Unless you attack the lights directly with a hammer, they're not going to break. If they ever do break or burn out, you can remove the lights without removing the boxes, using an ordinary cutlery teaspoon. Just pop it out (do it on a warm day), unplug it, plug a new one in, and pop it in. But I'm expecting these LED bulbs will last a long time without any replacement needed. These are AWESOME!