I believe they are chinese made and not much cop. I haven't had an experience with them personally but I have heard of them before and got told to steer clear.
I now always buy Halfords Professional or Industrial. They are made by Sykes Pickavant for Halfords so are of a decent quality. They are reasonably priced and they have a lifetime guarantee (just don't lose the receipt). I have never had any problems with replacments. They even stumped up for a new lock and key set when the key broke off in the lock of my toolbox even though it could well have been me being heavy handed.