That's just a Stahlwille Manoskop 730/20. If you use it opposite the direction of the arrow on the handle it's a breaker bar. You can get a ratchet head insert for them also. I have a 730/65 and used many variations of them while working as a Porsche tech.
You can often score them for cheap on eBay. No sense in getting just the tool holder as the torque wrench is legitimately designed to be used as a breaker bar in reverse.