I recently saw a bike lock from China that is supposed to be un-pickable. Its key has a tip like a philips head screw driver and four regular key serrated edges up the shaft that operate four separate cylinders in the lock head itself. The opening in the lock to insert the key looks like a four pointed star. Some guy in our bike club was offering to bring some back at $5 a pop but it seems that duplicate keys are hard to get here. Is anyone familiar with this type of lock (did my description make sense)? I can just see myself losing the keys and not being able to get replacements.