Our hay and grain feeders are made from 100% post-consumer high density polyethylene plastic. They are made to hold up to rough animal abuse and are UV-stabilized to withstand prolonged exposure to the sun. These dual-purpose feeders may be mounted on a fence rail or to a wall. They feature four 3/8” mounting holes. Opposite to metal, our plastic hay rings will not rust or corrode and thus will not leave sharp, exposed metal edges that could potentially cut you or your livestock which could lead to costly medical or veterinarian bills. These plastic products will provide you with years of use and convenience.