Whether a beginning lock picker or a veteran locksmith, everyone needs practice with different types of locking mechanisms to stay on top of one’s game. Secure Pro's Clear Cross Practice Lock is a great way to learn and hone your skills on a four-line cross lock, also known as a “cruciform” or “Zeiss” lock. These advanced locks are often found on steering wheel security bars (e.g. “The Club”) and sometimes in safes, either as the primary locking mechanism or as a backup in case the combination is lost or forgotten. Characterized by their cross-shaped keyhole (looks similar to Philips head screw), these locks are especially secure and tricky to overcome with their extra shear lines. With its transparent shell, the Secure Pro Clear Cross Practice Lock allows you to see the inner workings of a cruciform lock 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 master key.