Supports hammers with a diameter of up to 34 mm and a shaft diameter of up to 30 mm. There are also other versions for bigger hammers.
In order to have the maximum strength in the hooks you should print the part using this orientation (organic supports, on build plate only):

I printed this in PETG with a 0.6 mm nozzle, 0.32 mm layer height, 5 walls/perimeters and 20% Grid infill.
On request I can provide versions with other diameters or you can modify the STEP file yourself.
The author remixed this model.
Increased diameter to 34, 44, 60 and 70 mm.