The standard screwdriver sets consist of all 4 driver racks XS, S, M, L, and LX.
The XS (extra small) fit a set of husky small drivers and the LX (extra large) is for HFs 6 in 1 screwdriver which I use a lot. 80% of my old USA made craftsman and Husky drivers fit nicely in the Medium and Large size.
These accept 20x10x4 bar magnets press fit. These big magnets are overkill, but work well to hold everything firmly in place.
A precision set was uploaded here:
Screwdriver Organization Racks (Precision Drivers)