The Corner Mount Poly Hay & Grain Feeder holds up to three flakes of hay and four gallons of grain. Designed with horse health and safety in mind, this feeder has no sharp edges or corners. The added ventilation keeps hay and forage fresh longer which reduces feeding costs. This feeder is easy to mount in stalls or on doors and works perfectly in our Sentinel Horse Stall. The galvanized version of this feeder works great in salty, coastal regions.