This model holds jobber drill bits for sizes 9mm, 9.5mm and 10mm. It is intended to compliment the “small” and “medium” drill bit holders originally made by creator “Flash72”.
Please see the original models here: https://www.printables.com/model/460411-gridfinity-drill-bit-set-holder
There, sizes all the way up to 13mm are accommodated. However, if you have a drill bit set which is only 1-10 mm then this will be the perfect companion to save some space and not have empty drill bit slots.

The pictures show this model and then also the “small” and “medium” models available from Flash72 in the link above which hold drills from 1 - 8.5mm.