This is the left hand version of the tool that decodes and picks locks that use the standardKW1 key and Kwikset depths and spacings. Sometimes it is difficult to read the standard tool if the knob is on a right-handed door and close to a wall. This tool works withalock even if it has spool pins. The best part is that while you are picking the lock, you are also decoding the lock. That means that you don’t have to take it apart to make a new key for it.Just write down the code as you are picking and then use your code machine or your depth and spacing keys and a standard duplicator to make a key to fit.