These are two Wahl clipper guides in 2 inch (50mm) and 1.5 inch (37mm) sizes.
Should work with most 1.87 inch (47.6mm) max. wide Wahl style clipper blades.

They are intended to be used with the clipper horizontally, on the side parallel to the cutting head plates, but when used with the clippers vertically, the hair length will still be maintained.

The orientation for printing should be as shown above in the .stl files to print properly with minimal support required.

I have also included the gcode for using PETg on a Prusa MK3S, in case that is what you are using.