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PCB mounting holes are an important part of PCB design, as they allow the board to be securely mounted to a larger system or enclosure. The location and size of the mounting holes are typically specified in the PCB design, and can vary depending on the specific application and mounting requirements.

Mounting holes can be created using a variety of methods, including drilling, routing, or punching. The holes are typically plated to ensure good electrical conductivity and to prevent corrosion. The holes may also be surrounded by a copper pad or annular ring to provide additional support and stability.

In summary, PCB mounting holes are holes that are drilled or routed into a printed circuit board to allow the board to be mounted to a chassis or other object. They are an important part of PCB design and are specified in the design to ensure proper mounting and support of the board.