I snagged this Today,I just couldn’t resist while at an electrical distributor.
It has 10 sizes built in including 1/4″ and 5/16″ drivers and takes standard 1/4″ bits of course.

Not too bad for about $20.00.

It is pretty strong and the 2 drivers lock in place fully open with a frame lock sort of release.
I can get a lot more torque on this than on many other Mt’s,not bad.