This practice lock set is suitable for beginners and professionals who want to improve lock picking skills and who always lose his keys. It's also a wonderful gift for kids whoare interested in structure and science. Features: Package includes 8 practice locks to meet your different needs. Visible design, allows you to see how the practice locks work. Training lock helps you practice lock picking and improve skills. Made of high quality stainless steel, sturdy and durable to use. Suitable for beginners and professionals, wonderful gifts for kids. Each lock is equipped with keys, helps you learn the mechanism behind the lock. Specifications: Material: Stainless Steel + Acrylic Package Size: 28 * 25 * 6cm / 11.0 * 9.8 * 2.4in Package Weight: 712g / 1.57lbs Package List: 8 * Practice Lock 17 * Key