Stealing wheels from cars, especially with beautiful and expensive alloy wheels is a lucrative business. That's why there are many thieves in the yards at night, who do not mind getting someone else's "wheels". In order not to leave robbers a chance to get rich on someone else's grief is worth installing secret bolts on the wheels. They can be unscrewed only with your key, which comes in the kit. The bolts are black and come with 4 bolts and a key nut.