Kason High Efficiency Portable Batch Sifter This portable Vibroscreen with Stand and Lockable Casters is ideal for scalping oversize particles from batches of bulk material as it is loaded or unloaded. The stand mounted on heavy-duty lockable casters provides in-plant mobility and processing flexibility. http://www.kason.com/Circular-Vibratory-Screeners-Separators/Available-Designs/Portable-Batch-Sifter.php