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The base material is made of high-quality cold-rolled steel plates from Wuhan Iron and Steel and Panzhihua Iron and Steel. The plates are precisely sheared and punched with high density. The process includes gas nitrogen heat treatment, heat preservation tempering and rust prevention treatment. The opening rate is 30%-40% for plates with diameters of 2.0mm and below, and 40%-48% for plates with diameters above 2.0mm. The finished products undergo strict quality inspection to ensure quality.