Screw-locking devices are designed to preventthe unwanted loosening of screw connections because of external influences suchas vibration or corrosion. The lock machine element is added to a screwconnection by the manufacturer as an additional component. This kit is used fordemonstration and information. It is not designed for performing exercises orexperiments. Screw-locking devices are shown in their installed state on analuminium plate. A transparent box contains a large number of Screw-lockingdevices. The kit is arranged clearly in a storage system.