The snake mesh has really small grids, and because of this, it can keep it's shape longer than chicken wire. I had a hard time, removing he U-nails from the snake mesh recently - when I had to replace the wooden handles on my tractor.
I looked around the internet, and couldn't find any way to remove them, which didn't involve a screw-driver, or tools I didn't possess. I successfully removed some with a screwdriver, otherwise, I made mince meat of my knuckles when I'd slip and run them against the mesh. Three slips and two band-aides later, I devised my own method.
For anyone who wants to successfully remove U-nails from timber, get a small drill bit and put holes on either side. See above image. Then they slip right out with a screw driver. My knuckles breathed a sigh of relief!
This python was climbing up to the roof, about a week ago. And it's precisely why I use snake mesh, on a chicken tractor, designed to hold chicks. Snakes can squeeze through some small places, because they're effectively all muscle. They would love to make a meal out of my new hatchlings.
Well, not if I can help it.