Yale MultiLife door cylinders are in the range of "user programmable" Euro-profile door cylinders that fit various Euro-style mortise locks. The programmable function of these door cylinders gives users the flexibility to change the cylinder configuration by themselves instead of replacing the door cylinder once the key is lost or for any reason that they need to change their key. We have developed additional features that increase the durability of the door cylinders. The keys are made of high quality solid nickel, which are long lasting. Key duplication services are provided by authorized locksmiths.