This is a drill bit index for 1/16" to 1/2" drill bits in 1/64" increments. The 3/8" and larger have holes for a 3/8" shank, so if your bits have full shanks for they wont fit. The holes are oversize by 1/64" and have chamfers to allow the bits to fit easier.
The back is slanted with cutouts so that it will sit flush and angled against a pegboard as shown in the picture. Two standard pegboard hooks will be needed to mount it to the pegboard. Screws could also be used to mount it to any vertical surface.
Note: this will not sit on a flat surface by itself without falling over due to the slanted back.
Best printed standing up with the holes facing upward. May need a brim to help with bed adhesion since the upper portion will be printed cantilevered over the base.
The holes are oversized by 1/64" to allow the drill bit shanks to fit. If the printer is calibrated properly then you shouldn't run into any issues. If the holes are too small you can add a small negative "horizontal expansion" in Cura.