25 x 17 mesh spaces (windows) or 51 x 35 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: Unknown medium weight (3) cotton (blue)
Colour B: Lily Sugar’n Cream (white)
Hook: 4.00mm
Border: Blanket Border (round corners)
Dimensions: 294x209mm / 11.5x8.25in