温州宏丰：公司生产的硬质合金棒材可应用于下游客户深加工PCB钻头、钻针

Group 1 - The company, Wenzhou Hongfeng (300283.SZ), is involved in the research, manufacturing, and production of hard alloy products [2] - The company's hard alloy rods are utilized by downstream customers for further processing into PCB drill bits and drill needles [2]