Group 1 - The company Henglin Co., Ltd. (603661.SH) responded to an investor inquiry regarding the type of diamond used for PCB drill bits and whether its subsidiary, Henan Shining Diamond Co., Ltd., produces such diamonds [2] - Henan Shining Diamond Co., Ltd. has a business scope that includes jewelry manufacturing, non-metallic mineral products manufacturing, non-ferrous metal alloy manufacturing, and metal tool manufacturing [2] - The products developed and sold by the company include synthetic diamonds and large-sized diamond single crystals, which contribute a low revenue proportion and do not significantly impact overall performance [2]

Core Viewpoint - Henglin Co., Ltd. (603661.SH) operates through its subsidiary, Henan Shining Diamond Co., Ltd., which is involved in various manufacturing sectors including jewelry, non-metallic mineral products, and metal tools [1] Group 1 - The company’s product offerings include cultivated diamonds and large-sized diamond single crystals [1]