Grid spacing

[mls18]

I just got C&H Grids for my guinea pigs' cage. The squares in the grids are around 1.7 square inches (4.28 cm) Is that too big? I saw that the maximum is 1.5 inches, so these are just a bit more. Is it fine?

 

[Piggies&buns]

This guide will help explain further.
Gaps which are too big pose a danger of getting their heads stuck.

Which C&c Grids Are Piggy Safe?