I have eight altogether. But the three main are keyed the same. And the ramp only is locked when it is in storage or I am shopping in a store. The tool, trailer hitch and cage are the least used. The mowers are locked with a krypto combo lock with the same combination. (Move one #off and it is easy to lock and un-lock quickly). The edger and trimmer and cage are the same. The blower has a key/combo lock that is the same combo as the mowers. (I figure that if I some day need to hire some one they would be able to grab the blower with out a key) Yes it seems like a lot, and I know it is only a deterrent but, when you work alone you need to do something right. Once you get in the habit of locking and unlocking the stuff it goes very quick. Quicker than running home to get you back-up equipment!!!! This only gives me piece of mind grant it. But I figure doing something is much better than doing nothing.