Euro Cylinder and Turn. To lock the door on the inside, simply use the turn knob, there's no need for a key Polished Chrome Finish Supplied With 3 Specially Manufactured, Hardwearing Silver Nickel Keys As Standard Keyed Alike & Master Suites Available: Keyed Alike - Any number of Cylinders all opened by the Same Key pattern Keyed To Differ - A single Cylinder with an Individual Key pattern Master Keyed System - Any number of Cylinders each with an Individual Key pattern, a single Master Key opens all Cylinders in the system Please be aware that the Keyed Alike and Master Keyed Options are made to order and therefore cannot be cancelled or returned once purchased. It is therefore advisable that before ordering; please remove your existing cylinder and measure it to ensure you are ordering the correct size MASTER KEYS SOLD SEPARATELY - PLEASE SEE RELATED PRODUCTS