The "Trash Without" allows you delete files (also a group of files/folders) without using the Trash on your hard disk, USB, memory card.
Are you tired of cleaning the Trash of a single large file that you don't exactly need?
Do you need to free up disk space urgently, but you have the files in the Trash, which may not have been deleted?
The "Trash Without" is the fastest and easiest way to delete files/folders without using the Trash.