Roll your own — single disc
There are 18 stitches. Move the control points side to side, or enter exact values in mm in the boxes.
Maximum stitch width is 3mm (check this). The stitch width lever at the bottom of the chart can be adjusted so you can see how it will look at different settings.
Stitch length is fixed, and set by the stitch length lever to the left. Use this to see how your stitch will look at different settings.