What is the purpose of this type of header? Recently got a whole bunch of headers from Ebay (very low, sometimes none, shipment costs :) ), both male and female, but the standard 2.54mm male headers do not fit in this type of female header. After coming across this page I read about there being round and square varieties and they don’t seem to be compatible with each other.
So why does the round female variety even exist since you can’t seem to use it with standard male headers?