The Medeco 1-1/8" Lock Mortise Cylinder Keyed 51S with 2 working keys is a high-quality, American-made key designed for mortise locks. With a length of 1-1/8 inches, this key is compatible with specific Medeco lock models and provides security for your home or business. The key is made by the reputable brand Medeco, ensuring durability and reliability for entry into your property. With two working keys included, you can easily share access with trusted individuals while maintaining the security of your space.