We've sold stacking headers (https://www.adafruit.com/search?q=stacking) for a looooong time - longer than the pins' tails, which allow them to stack shields or daughterboards of various kinds. The kind we have are about 0.4mm by 0.6mm, but we got a request to carry 'square' pin versions that will seat better in solderless breadboards and loose sockets. The samples we got are gold flash and 0.62'ish mm square, and they seem pretty good! we'll swap to use these next time we book an order.

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#electronics #makers #soldering