The padlock is one of the oldest locks in the whole world. All other locks are known to have been derived from padlocks. Safety padlocks belong to the category of padlocks. In today's society, safety padlocks are also commonly used for industrial safety, which is to safeguard occupational safety and health. When using a padlock, the user must establish a safety procedure by which a proper lock is applied, thereby bringing the equipment to a halt. In recent years, there have been a number of instances in which employees have been injured due to human error.