That's actually a pretty kickass toolkit.According to iFixIt, it's a "hook drive," which, I guess, means it's for screwing in (or out) screw-in hooks. It's in the 1/4" drive bits section of their Manta Driver Kit.
https://www.ifixit.com/Store/Tools/Manta-Driver-Kit--112-Bit-Driver-Kit/IF145-392