These screens are 5-5/8 OD and 5ID, 3-3/8 Tall. For Gold Panning, this is the ultimate classification process Simply stack your 10 mesh classifier on top of your 30 mesh. Classify the material through both screens. Pan the materials separately for the best gold extraction possible This Homemade Compost Soil Sifter Garden Tool DIY Project can be made with minimal skill level and on a frugal budget. Actually, this can be a muilti. Making a bucket classifier.This video is part of a video series made for a high school gold mining and mineral prospecting course.