ASR Outdoor DEEP Stacking 1/4" Classifier Screen with Handles, Heavy Duty 5 Gallon Plastic Sifting Sieve1 4" CLASSIFIER SCREEN: Featuring 4 holes per square inch, this classifier is ideal to use towards the end of the classification process when working with finer materials; six inch depth allows for large amounts of material processing and can be stacked on top of a 5 gallon bucket 5 GALLON BUCKET CLASSIFIER: Gold rush plastic sifting screens have been designed to stack on top of a 5 gallon bucket to create a vertical classification system, and are