Save time and improve your gold recovery with this 30 mesh classifier sieve. These sieves are used for sizing material down before processing with a sluice box or gold pan and hold more volume than shallower models. 30 mesh and other sizes are also often used to pre-screen material for use in goldwheels, gold bowls, shaker tables, and other advanced gold recovery devices. See the device instructions for the recommended mesh size or sizes. You can stack various mesh grades together for multi-tiered classification. The sieve conveniently fits into the top of most 5-gallon buckets and is constructed of high-impact plastic and stainless steel mesh.