This set of 50 M1 brass key blanks is perfect for locksmiths and anyone in need of extra keys. The keys are compatible with M1 padlocks. With these key blanks, you can have peace of mind knowing that you always have spare keys on hand. They are a great addition to your collection of locksmith tools or as backup keys for your personal M1 padlock. The keys come in a set of 50, making it easy to distribute them to multiple users or keep them in various locations.