It's a steel lugnut. Pretty strong stuff, but anythings possible. If they want the wheels bad enough, nothing you can do, besides sitting outside with rifle in hand is really gonna stop them. Most likely, the locks will be bitch enough for the common thief to probably just leave it alone. Dunno really . . maybe just be careful where you park, or get an alarm on top, or just wish that you have good luck. Then there's always insurance if you need to use it. Thieves just suck donkey dick alltogether.
It's actually 27.94 shipped, no tax. This is the best price I could find. It lists for 40.
You get one locknut for each wheel (that's all you should really need) & one luglock key, which you shouldnt store in the car.
12 X 1.25 is the thread size we have