t-post steel disks (D=8 in/20.3 cm), laser cut
Downward pressure applied to the hay bag by the horse when eating can drive the t-post further into the ground. This also takes the hay pole and hay bag with it, soiling your hay when the bag reaches ground level. My unique t-post disk will transfer the horse's pressure from the hay pole to the disk, which will prevent the hay pole and t-post from sinking any further into the ground.*
A word of caution: These disks are cut with a laser, which may leave minute (barely visible), but very sharp, slivers of metal debris on their surface. So handle these with leather gloves
to spare yourself the misery of having to find and pull metal splinters out of your bare hands. I learned the hard way myself! Just wear the gloves!