This one just has all the bits an HVAC guy needs. There is a bit for schrader valves, a bit that fits breakers and 2 sizes of flathead/phillips. There is a non ratcheting version for those that do not like the ratchet. Klein sells the exact same screw driver, I just do not like the bits as much. https://www.amazon.com/Ratcheting-Screwdriver-Klein-Tools-32558/dp/B005FQDHBI