Standard laboratory sieves feature precisely processed square apertures with even distribution for consistent and accurate sieving performance. Includes bottom and cover to prevent sample loss and dust scattering during use. Sieve combinations include a 10-piece sand and gravel set (0.075mm–9.5mm) and a 14-piece stone set (2.36mm–90mm) for both fine and coarse particle testing. All components are designed to provide a comprehensive solution for construction and mining applications. The seamless anti-leakage design features a double-layer stamped structure with tight edges that prevent fine particles from escaping, enhancing test accuracy. Smooth surfaces and rounded edges ensure safe handling and stability during daily operations. Constructed from high-strength stainless steel, this product offers durability and resistance to deformation over time. It is easy to clean and maintain, compliant with national standards for concrete sand and gravel inspection. Service: We value our customers' shopping experience! If you have any questions, please feel free to contact us, and we will get back to you within 24 hours!