DIN cylinder locks are extensively used in Europe and America in sliding glass door applications. The locks are also used in room dividing doors. DIN cylinder locks are available in many varieties i.e. one sided/single cylinder, double cylinder/locking cylinder on each side and single cylinder featuring a thumbturn (a locking cylinder and thumbturn; one on either sides). DIN cylinder lock exterior and optionally interior lengths vary. Other dimensions are usually standard. It is worth noting that DIN cylinder locks are usually held together using a single screw running through the center of the cylinder in majority of the applications. It is worth noting that the DIN cylinder lock can be snapped off a door easily since it is attached on a single small point. Additional reinforcement is therefore needed if the lock is intended to offer serious access restrictions.