18 x 18 mesh spaces (windows) or 37 x 37 sts before borders

Interlocking Patches can be made using any yarn/thread and an appropriately-sized hook. Documentation includes further discussion and may be downloaded separately at https://interlockingpatches.com/docs.

Sample (pictured):
Colour A: Patons Classic Wool Worsted (dark green)
Colour B: Istex Lettlopi (brown)
Hook: 4.25mm
Border: Blanket Border
Dimensions: 244x244mm / 9.6x9.6in