Tool-free attachment and individually height-adjustable. The full extension allows for complete opening of the Systainer lids for quick and easy access to machines, accessories, and hand tools. The shelf serves for the storage of Systainers. A handle recess ensures easy insertion and removal. The central locking mechanism guarantees secure hold during transport. For individual customization of the mobile workshop MW 1000, additional extensions can be easily retrofitted. This special extension simply clicks into the aluminum profile of the MW 1000 and locks in place.