Small: 2.25" x 5" size openings for super fine grass hay such as Coastal Bermuda Teff hay brome chopped forage and very fine alfalfa and fine hay that is conditioned.
Medium: Our original grate size with 2.75" x 6" size openings for most cool-season grass hays such as Timothy and Orchard and some finer grass alfalfa mix hay - not for very thick or coarse hay.
Large: 3.25" x 6" size openings for alfalfa and alfalfa mixes some peanut hay and for older horses who have difficulty grasping hay – and for long-stranded hay from a large round bale.
Replacement grates come with that amazing rip-stop fabric already attached. All you have to do is unscrew the acorn nuts with a 3/8 wrench and a phillips head screwdriver. The process takes about 20 minutes.