Both clip & solid variants of ½" hex axle spacers in 1/16" increments, common for FRC use.
The parts include their length debossed on one side, no more measuring random spacers to find the one you need.
Parts are named as such:
LENGTH-HEX_BORE-CLIP
Length and bore are in inches.
If you would like to modify the file or create other configurations, here is the Onshape link.
The author marked this model as their own original creation.