The holes are for the fixing screws, that go though from PCB rear side.
If fixing screws are required, HIF3B*-**P-2.54W(88) is recommended.
It is nut built-in type that can be...
The criteria is;(1) Signal contact
The fillet is formed and gets wet sufficiently.
(2) Power contact and reinforcement metal The through hole is filled with solder firmly.
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