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.

Before You Purchase A New Replacement Grate, Did You Know That You Can Sand Down Any Rough Edges With A Small Sander Or A Dremel With A Sanding Attachment? It's Pretty Easy To Do. Rough Edges Can Happen From Feeding A Dense Hay Like Alfalfa, Packing The Hay In Too Tightly, Feeding Dense Hay In Cold, Icy Conditions, Or Just From Prolonged Use.

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.