Generally speaking, locks made according to mechanical principles need to be opened by inserting a key into them, such as door locks, bicycle locks, safe box locks, etc. In this way, a keyhole is naturally formed so that the key can be inserted normally. The size and shape of the keyhole are set for a key that matches the lock exactly.
There are many materials that can be used in tattoos. Today I will introduce you to the keyhole tattoo. These tattoos are very special, and many people like these keyhole tattoos. If you don't know what tattoo pattern to choose, you must consider the lock hole pattern, because the lock hole pattern will enhance your connotation.