【A. Sand and Gravel Sieves】0.075mm, 0.15mm, 0.3mm, 0.6mm, 1.18mm, 2.36mm, 4.75mm, 9.5mm, bottom + cover (10 pieces total). 【B. Stone Sieves】2.36mm, 4.75mm, 9.5mm, 16mm, 19mm, 26.5mm, 31.5mm, 37.5mm, 53mm, 63mm, 75mm, 90mm, bottom + cover (14 pieces total). 【Precision 30cm Square Aperture Design】Features a 30cm diameter frame with uniform square apertures, ensuring accurate particle separation and consistent results for sand, gravel, and aggregate testing across diverse industrial and laboratory applications. 【Durable Double-Layer Seamless Structure】Machine-stamped with a seamless double-layer edge to prevent material leakage, while smooth, rounded edges provide a comfortable, safe grip that eliminates hand injury risks during frequent handling and operation. 【Premium Stainless Steel Construction】Crafted from high-quality stainless steel for long service life, resistance to deformation, and easy cleaning—ideal for repeated use in harsh laboratory and field testing environments.