Many tools require some sort of maintenance in order to keep them in top condition. Certain tools require a specialised type of maintenance, lubrication. This is especially true for tools with many moving parts and internal mechanisms.
In order to lubricate certain tools, they may need to be opened up. Power tools are good examples of this, their internal mechanisms like the anvil and impact motion need to be accessed to be lubricated, which are located within the tools casings. Lubrication is often all that is required as many modern tools have been designed in such a way that they are as simple as possible to maintain.
Maintaining and lubricating tools not only increases their life span, but also improves their functionality. This allows tools to perform at their highest levels, which is crucial for work shops and maintenance technicians that work to very high standards.