What looks like a simple mortise cylinder is, indeed, so much more. This cylinder is designed to improve your picking skills and features the following: top mounted plugs to add or change the pinning of the cylinder, the ability to increase or decrease difficulty based on the number of chambers pinned up, the ability to pin the cylinder to your current level of ability, the option to change the pinning so that as your ability improves, so does the difficulty of the pick, and a complete series of springs, standard pins, and security pins so that your lock cylinder and picking abilities can grow with your needs and skill level.