"Make your door smarter with the Linus(R) Smart Lock designed to secure and simplify your life. Depending on what kind of euro profile cylinder is currently in your door, you may need to change it in order to be compatible with the Linus Smart Lock. The Linus Adjustable Cylinder is guaranteed to work with the Linus Smart Lock. There is no need to measure your Euro cylinder equipped door as the adjustable cylinder is designed to expand to fit your door. Make the Linus Adjustable Cylinder the same length as your current euro profile cylinder using the appropriate external and internal spacers. What's in the box? - Yale Linus Adjustable Cylinder x1 - Internal spacers x 3 - External spacers x 3 - External faceplates x 2 - Allen keys x 2 - Tail-bar x 2 - Screws x 4 - Keys x 2 - Key card x 1 - Quick start guide x 1