Number combination lock is like a mystery game of combinations and sequences. With the use of mathematical logics and basic laws of physics (balancing of forces) the old traditional padlocks have been replaced by new and modified number combination lock. Padlocks are the portable locks that were designed to defend against any theft, vandalism or sabotage but with passage of time they became part of day to day life as a safety measure. Padlocks used earlier were heavy and required key to unlock but with number combination lock it becomes easy to handle the system as only thing that is required is a code which can activate or deactivate the lock. Now, all one has to do is set their code and activate the lock. Let’s take the insight of number combination lock in the following section stepwise from its outer parts to the innermost components.