They're pretty cool - I hadn't seen them before I found them at Revain. They work great on my ATV trailer. I used one on each side of the gate. They have a fuse - something you have to press to open it. Nuts are nylon. In general, I'm sure they'll stay firmly on the road. However, they are a bit small, with small mounting holes and access to those holes in a place where an outlet won't fit. Overall, while I'm very happy with it - a solid product, I'll likely get more for other projects in the future.