This stone sieve set provides a simple method for sorting stones, beads and pearls according to size. Each of the 42 precision-drilled, polished sieve plates (2-5/8" dia.) are clearly marked for easy identification and fit into a chrome-plated steel cylinder with end caps. The cylinder separates at the center, allowing you to place a plate in each half to accurately sieve your stones. When not in use, store all the plates inside the cylinder. A padded zipper case is included.