As to those new locksmiths， it is quite a necessity to buy a set of professional locking tool for daily practice. This AML020178 Professional Section View Style Locksmith Exercise Tool Flat Lock with Keys must be a wonderful recommendation. It is a cutaway lock with the perspective on all the moving parts that allow you to see how it works.Made of first-rate iron and copper materials， the lock is of great quality and durability. It is in special treatment， with section view design， which allows you to clearly and visually observe how the locking task finishes. It provides exact inner structure of the lock， and makes you learn the working principle by watching the whole process. A helpful tool for you all!                                    Features            Consist of a lock and 3pcs keysMade of high-grade iron and copper materials， reliable and durableDesigned into section view style， show the specific inner structure to you and make you get overall acquaintance of locking performancePerfectly suitable for professional locksmiths or beginnersCompact size， easy and convenient to carry                                                            Specifications            Quantity    1    <br>Color    Black !#!amp!*! Silver    <br>Material    Iron !#!amp!*! Copper    <br>Lock Dimensions    (3.15 x 1.97 x 0.79)" / (8 x 5 x 2)cm (Lx W x H)    <br>Weight    8.82oz / 250g    <br>Brand    AML    <br>Model    AML020178    <br>                                                            Package Includes            1 x Lock3 x Keys