This is for the pros. Made from layers of tire-like rubber rather than plastic or soft rubber, the bolts are very strong. They are more expensive than others but they are worth it. I'm a humble guy, but when it comes to my safety or that of my family (my sons help me service the car so they can learn what the older generation did and not just use computers and gadgets), I do don't save, think about it, how much is your security worth?