McGard 24193 Chrome Cone Seat Wheel Locks (1/2" - 20 Thread Size) - Set of 4 Buy Now

This is a great product at a great price. I have a one axle trailer so I will use two locks on the trailer wheels and one on the spare tire.
This gives me one extra in case I lose one.
Just be careful to not lose the key. It can be expensive.Get more detail about McGard 24193 Chrome Cone Seat Wheel Locks (1/2" - 20 Thread Size) - Set of 4.