This is a 4 piece set of stainless steel bonsai soil sifters. They can be used for sifting for gold, or fire or crime scene evidence. Or just typical garden soil sifting. The set consists of a 2 3/4" frame that is 11 3/4" in diameter and 3 screens. The screen mesh sizes are about 1/4", 3/16", and 1/8". Used for screening out your own ingredients to make bonsai soils with various aggregate and bark sizes according to the size and type tree you are working with.