Vibrating Grizzly Feeders are smaller in size than Apron Feeders. They are used for: Small and medium capacities; Smaller in size than an Apron Feeder; Where presorting is required before a crusher ; Close to uniform feed rates; Can be used for many types of materials; Popular Appliions for Feeders. Feeders can be used in a variety of appliions, including gravel, sand, limestone ...