What has one horn and gives away milk every day?

I help plants climb up toward the sky, I’m like a wall, but holes go by. I’m criss and cross, a wooden net, What am I that flowers can’t forget?

I’ve got six pockets Four legs. And Sixteen balls that like to get smacked.

A familiar sight in locker rooms and forbidden doors, or maybe even a bridge in France, if you're so inclined? A valient guard thay has been around for centuries! And in its jaws, with a clean snap, you can feel assured that your treasure is well secured. Unless, of course, something with bigger teeth comes by to bite through iron bone...

Creak creak, is all one may hear, sans lube I'm a feared.