18 x 12 mesh spaces (windows) or 37 x 25 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):
Yarn: Patons Classic Wool Worsted
Hook: 4.00mm
Border: Blanket Border
Dimensions: 205x150mm / 8x6in