The Excavator Lock mechanically lock the drive controls of all excavators (mini and large) in opposite directions. Even if the key is available the machine cannot be driven and in most cases cannot be started. This device has a high security built-in barrel key type lock mechanism and two keys. Multiple units may be keyed alike. Call us toll free 866 LOK IT UP or visit equipmentlock dot com Prevent theft, vandalism and unauthorized "borrowing" of your equipment.