The Master Lock No. 6621 ProSeries® Weather Tough® Padlock is built to endure harsh outdoor conditions while delivering robust protection for industrial and commercial needs. The exclusive Weather Tough® cover safeguards the lock from water, ice, dirt, and grime, ensuring reliable performance in extreme environments. With the option to choose from 22 Key-in-Knob keyways, you can match this padlock to your security door locks for seamless integration.