UZZO trade;Cutaway inside view of Practice Padlock Lock training Skill Pick for Locksmith With 1Free Keyring Overall Size: 78mm x 50mm Quantity: 1 pc cutway padlock + 1 pc key; Lock with open chambers on all the moving parts that allow you to see how it work. You can see clearly that how the pins work when a key is inserted;You actually can see the pins moving up and down as the key slides into and out of the lock In perfect smooth working condition with no loose parts or pins will come out