This set forms a circle, photo of the slice shows one-eighth of it.
How to use the extruder disc: Watch here
Extruder disc may not fit all extruders, measurements found here.
Thicknesses used (on Atlas):
Base - #2
Side strip - #3
Orange part - #1 folded once
Approx cutout measurements:
Diameter of entire circle: 4.2cm (1.7in)
One size only.