I'm looking for a reliable locking system for my wheels to prevent being stolen, specifically for the front wheel as I always attach the rear one together with the frame with the U-lock.

I look for something easy, not an additional wire or U-lock. I found several systems ranging from 15€ (Zéfal, [Point](https://www.amazon.es/Point-29104001-cierres-protecci%C3%B3n-antirrobo/dp/B0038VV93K/ref=sr_1_2?ie=UTF8&qid=1499279879&sr=8-2&keywords=tuercas%20antirrobo%20bicicleta)) to 36€ ([HexLock](https://hexlox.com/) - this is pretty cool and seems secure to me).

Back to Zéfal Lock'n'Roll - wouldn't it be possible to break it just with a pliers, using it to unscrewing the nut at the other side of the lock? It seems a plain nut to me and even don't have cone shape to avoid to be caught and unscrew with the pliers.

So do I am right? Anyone can confirm it? Is then more secure than a plain nut?