Great News: Only $2 for PCB Prototype, Any Color !
From now on, there is no extra fee for different color of solder mask such as black, blue, red, yellow and white.
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What is Castellated holes / half cut holes?
Castellated holes is PTH holes or via that are cut through to create a partial or half holes to form an opening into the side of the hole barrel. Generally, it is used for mounting a PCB to another one.
To make Castellated holes, the hole size needs to be 0.6 mm at least and the space between the holes also needs to be 0.6 mm at least.