For students and hobbyists new to lock picking， we highly recommend this AML020190 Transparent Cutaway Practice Cylinder Lock! It is made of transparent material so you can see how the internal components work inside the lock while you are working on it. Such a great tool is sure to make it easier to learn lock picking and improve your lock-picking skills significantly. It also comes withtwo keys for added convenience. Don’t hesitate to buy now! It surely is worth buying!                                    Features             Designed specifically for students and hobbyists new to lock picking<br> Transparent construction lets you see how the internal components work inside the lock<br> Make it easier to learn lock picking<br> Improve your lock-picking skills significantly<br> Come with two keys for added convenience <br>                                                            Specifications             Material     ABS & Stainless Steel    <br> Color     Transparent & Blue    <br> Dimensions     (2.36 x 1.34 x 0.75)" / (6 x 3.4 x 1.9)cm (L x W x H)    <br> Weight     3.52oz / 100g       <br>                                                             Package Includes            1 x Lock <br>2 x Keys<br>