SIZE - 400 mesh test sieves,304 stainless steel lab sieves,aperture lab sieve,10cm/4" diameter, 4.5cm/1.77'' height. PREMIUM MATERIAL - The lab sieves made of double-layer frame & 304 stainless steel fine mesh,strong corrosion resistance. WELL-MANUFACTURED - Standard 304 stainless steel screen mesh,uniform and precise aperture,easy cleaning. Durable - High temperature and low temperature resistance,corrosion resistance,smooth edge,lightweight but strong. APPLICATION WIDELY - Ideal for straining powder,aluminum,zinc, sand,soil and other impurities, even setting for filtering organic liquids in lab.