This is the complete system kit for learning the art of picking pin tumbler locks. It consists of a table-top "door" practice stand with five interchangeable brass pin tumbler lock cylinders. Each lock has 1, 2, 3, 4, or 5 pins and is numbered 1 through 5. Included are all necessary tools and fittings and a learning guide. The progressive learning system utilized is based on positive reinforcement of learned skills as one progresses rapidly from picking a 1 pin lock up to a standard 5 pin lock. It's a unique and ideal system for learning basic lock-picking skills as well as being a great testing ground for new picks and methods.