Many locks, especially those used outdoors, have small holes next to the keyhole. These holes serve an important function: they allow rainwater and moisture to drain out, preventing rust and ensuring the lock remains easy to operateWithout these drainage holes, water can accumulate inside, causing the lock to rust and become stiff. To maintain the lock’s functionality, it’s best to choose locks with these drainage holes, particularly for outdoor use. Additionally, always ensure the lock is positioned downward to allow water to drain after rain.