These quality stainless steel classifiers have rugged plastic bodies with stainless steel screens. They are 12 inches wide at the top and are tapered to fit in the top of a 5 gallon bucket. The overall height is 3 1/2 inches and designed to allow for 4 of the classifiers to be nested with an overall height of only 8 1/4 inches. They are easy to use and a must for proper fine gold recovery.