Product Introduction: Commonly used expansion rings come in three sizes: 4 inches, 6 inches, and 8 inches. 4-inch expansion rings are mostly used for manual operations, while 6 inches and 8 inches are mostly used for automatic solidification machine operations There are currently two commonly used crystal expansion rings: white and green. The applicable equipment includes ASM solidification machines, as well as domestically produced solidification equipment such as Daying CNC, Xinmeimei, Weikong Automation, Cuitao Automation, Zongke, Starry Sky Electronics, and Xinyichang Electromechanical.