offers 54 450*200 h beam products. About 57% of these are steel h-beams. A wide variety of 450*200 h beam options are available to you, such as q235b, ss400, and q235.
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offers 175 h beam 450*200 products. About 41% of these are steel h-beams. A wide variety of h beam 450*200 options are available to you, such as q235, q235b, and ss400.
Description: The School Microscope is designed for younger students of elementary education. It meets the needs of Science teaching and demonstration to beginners at school level. Being light weight & handy, it helps carrying around and is simple to use, yet having features of a compound Microscope Precision Optical Glass Lenses and metal components are engineered for years of reliable