For starters this is NOT a beginner tool (you MUST have a clue as to what you're doing).
This is a SC1 there are 6 different SC1-6 keys. Don't purchase the wrong tool for the Lock (again KNOW what you're doing/buying).
Furthermore there are also KW1-6 keys as well as keys-lishi for vehicles (different makes have different keys).
Easy to learn and durable you can master it after several times training.
Nice portability in daily life The 2-1 combination hand tool can be easily stored in a toolkit or a storage bag. Convenient to carry around at will, without occupying too much energy or space.