They are tools commonly used in the Oil and Gas industry which assist in finding downhole reserves. They will be located near the bottom of the drill string and typically close to the drill bit....
The question tools section is located to the left, in the blue. It has many options to help the question. Please remember that only some options will show up after it is answered.
You may be thinking of a spanner, which is what the English call the tool that Americans call a wrench. Americans also have another tool called a 'spanner wrench'.