This particular PCB is a 6-layer construction designed to provide
reliable and stable performance for a wide range of electronic
applications.They are widely used in automatic machine, CNC
controller and so on.Gold finger on printed circuits board refers
to the gold-plated contacts or connectors located along the edge of
the PCB, It is commonly used in PCBs that interface with other
devices or components. They provide a reliable and durable
connection for mating with connectors or sockets. The gold plating
ensures excellent conductivity and corrosion resistance, making it
ideal for applications that require frequent insertion and removal,
such as memory modules or expansion cards.