List the materials added to the database. Selecting a material activates it. This allows it to be edited in this dialog. In the Tool Database dialog, it results in switching the cutting data of the tools to be the set defined for the active material / machine (if any).
Duplicates the active material and makes the new material active ready for editing.
Copy Cutting Data
This could optionally duplicate all the cutting data associated with the original material for all the tools so that there is a new set of cutting data for the new material as well.
Delete the active material and activate the next one up in the list.
Deleting Cutting Data
This is a destructive process deleting all the cutting data associated with this material across all the tools.