I got two boxes in yesterday(20 grids per box, 40 grids). They are 9 by 9 across, and here's a picture with a ruler for reference.
I put it by centimeters... Oops! It's about an inch and a half square.
I'm not sure how safe this is, but I put it for reference.
(Note: I am NOT using these as a cage. I set up a playpen in my backyard and will be setting up another in the spare room. They will be supervised the whole time!)
Again, I don't know how safe these are and I don't know if this has been mentioned, but I felt the need to supply it for reference.
Baby piggies can walk clean through the 36-8mm grid squares so if you suspect you have a pregnant sow make sure the lower portion of grids is securely lined with Coroplast or similar.
- Supporter 2004-2019
http://www.bedbathandbeyond.com/store/product/grid-wire-modu ... pxoCfTLw_wcB
http://www.walmart.com/ip/Whitmor-Wire-Storage-Cubes-Set-of- ... gMethod=p13n
Amazon also sells a set of...44? with connectors for $65.99. It seems like when I bought my first set of those things for college a million years ago, they were like $20 for a set of 30 with connectors.