Experienced key cutters can cut a lot of keys just form looking at them. My neighbour has a key cutting market stall, I needed a spare key for my Mondeo. He looked at my key on evening, said its a "xyyw" made a quick note of the number, the following day he cut a new key brought it round and it worked perfectly. He has done the same fora front door key as well! It's a bit worrying that someone could just look at your keys, go away make a key, and have access to your car/house/bike. Isn't the number the important bit? With the number and knowing what car its for, you can make the key. Was chatting to a bloke the other day who bought an ex-demo BMW 5series. 48 hours later it was nicked from his drive. Police reckon the thieves test drove it, cloned the key and fitted a tracker. As soon as it was sold, located it via the tracking device, turned up at new owners house and drove it away... That's scary!