These locks are designed to do a very simple job: make sure YOUR wheels and tires stay on YOUR car, not someone else's. I bought these as a gift for my son who has a very expensive set of wheels and tires on his BMW. The replacement cost is around $2-3000. Spending a meager $40 to protect them, how can you go wrong? I've seen several brands of wheel locks and they seem to be of a higher quality than most. The packaging (blister) is easy to open and for some reason even recyclable. The instructions (if you really need them) are clear enough and the suggestion to order a double socket is good. If there's one thing you don't want is not being able to find an outlet when YOU want to remove a wheel to replace a flat tire or change tires. A spare stock will save you a potential headache. Provided you don't forget where you put it. :-) Where to hold the outlet is kind of a dilemma. It is clear that he must be in the car. However, a potential thief who sees the wheel locks knows that the socket is in the car. So you put it in the trunk, knowing that a determined crook could open it in about 5 seconds? I definitely wouldn't. The position I suggested to my son makes it easily accessible, but it's not a place a thief would go unless they ripped the whole car apart. No I won't be handing out stock so just think and find your own which isn't obvious. The kit contains several stickers that indicate the serial number of the lock kit. One is intended for sticking an additional socket on the order form when registering with the manufacturer. The obvious temptation is to stick it on the car somewhere, which isn't really a good idea unless you're the kind of person who also gives out your social security number. :-)