Erva is the makers of quality metal lawn products for almost five decades and source of birds feeding and garden hardware This is the marketplace of an increasing awareness of ethics and sustainability Our bird feeding and garden hardware is safer from chemicals the land water and ...Erva is the makers of quality metal lawn products for almost five decades and source of birds feeding and garden hardware This is the marketplace of an increasing awareness of ethics and sustainability Our bird feeding and garden hardware is safer from chemicals the land water and air that is being protected and the wildlife that is being allowed to thrive and go green Features. You can use this metal plate to prevent squirrels mice and woodpeckers from chewing drillingSpecifications. Color Tan.