PCB"S allow for greater design flexibility than a flexible membrane switch. Standard thickness of bare PCB range from 1mm to 3.2 mm and the board can be single-sided, double sided or multi layer . A PCB allows components to be soldered directlyto the board. It also provides a wider, as well as more Connector locations , depending on the complexity of the design. In built Mounting screw can be used for fixing LCD, Dispaly PCB & Keyboards. Mainly used for Textile Industrial Automation & Control Panels . It eliminates backing plate.