Whether a beginning lock picker or a veteran locksmith, everyone needs practice, and the SecurePro Clear Practice Padlock is a great way to learn and hone your skills. With its transparent shell, this easy-to-use practice lock allows you to see the inner workings of a standard padlock and, thus, develop a greater understanding of its operation. It also affords a chance at trial and error with no problematic consequences, before attempting to tackle the genuine article. Includes two master keys. Measures 3” x 2”.