Bear with me , this might sound like spam, but it is something I have to get off my chest. The original Stanley Knife with the fixed blade was great invention. Simple and practical. Over the years there have been numerous copies with a retractable blade. This might seem like a good idea from a safety perspective but they soon malfunction. A waste of money. Also, I am quite certain that you cannot fit the keyhole saw blade or the metal cutting saw blade to a retractable copy that is available for a fixed blade Stanley Knife. I would welcome copies of the fixed blade knife being made. Another case keeping things simple.