The Problem: Normally we use different locks (safety lock, padlock etc.) whereas each lock has its own exclusive key. Then, it becomes so difficult to carry a bunch of keys of many a locks and secure handling of all the attached keys is also troublesome.

The Solution: Locks should be available in pair of 2, 4 or 6 with only one universal key whatsoever. This method, as a result, will require a universal key to open up any lock. The proposed pair of locks may be of any size and design but the inclusion of a singe & universal key would always remain the same. Now, you just need one key (instead of many) for opening or closing a lock.

This post was submitted by Farid Uddin Shahab.