Most padlocks are easily picked or destroyed by thieves. However, the Bowley Model 543 High-Security Padlock is nearly impossible to pick. It has a complex mechanism that has a dual-shielded core with 9 pins, and over 2.3 billion key combinations. Have fun picking this lock, thieves. This lock requires a series of pushes and turns to unlock. It features a 7/16″ hardened steel nickel plated shackle, 1/4″ thick hardened steel base plate, and an oversized body like a bouncer who is intent on keeping your things safe. It comes in aluminum, brass, or stainless steel.