Cylinders / Lock BarrelsAbout CylindersCylinder locks (also known as profile cylinder locks or barrels) are used in conjunction with another locking mechanism such as a padlock, cylinder lock case, nightlatch or most commonly UPVC door locks. There are many types of cylinders, the most common being Euro Profile Key & Key Cylinders (also known as Double Cylinders), Euro Profile Key & Thumb Cylinders and Rim Cylinders. We also have a range of Oval, Swedish and Screw In Cylinders. For more details on cylinders see Cylinders - Basic Information or to find out how to measure your cylinder see Cylinders - Choosing the Right Length |