Practice Lock, SeresRoad&reg; Clear Practice Padlock, Visible Inside View Lock, Cutaway Lock for Locksmith ,Lock Picking Practice Lock for Locksmith Good for Beginners Best Training Skill Padlock for Locksmith. You can see clearly that how the lock works. Best tool for training locksmith. Also, you can use it for education, showing it to your children. And they will absolutely become interested in it. Its beautiful and special actually. It can be a decoration. It is made of high quality transparent plastic.