We put the classic Master Lock 5400 series combo box under the microscope and decoded it step-by-step. No force, no destruction—just technique. This video breaks down how the internal wheels behave, what to feel for, and how a simple decoding method can bypass most common combination lock boxes. If you’re learning lockpicking, physical security, or just want to understand how these mechanisms really work, this one’s for you. ⚠️ For educational and security testing only. Always practice on locks

From the first worker on site to the last to leave, our lock boxes ensure the right people have secure access—keeping work on schedule. | Master Lock

87K views · 221 reactions | Quick demo of the rear diff lock operating in the new Isuzu MU-X. Full review and vid now live: https://www.carexpert.com.au/car-reviews/2022-isuzu-mu-x-review | Paul Maric | Facebook