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Single row of 40-holes, female header. Step: 2.54mm.
Can be cut to size with a pair of wire-cutters..
A row of headers - break to fit. 40 pins that can be cut to any size. Used with custom PCBs, general..
Note these have a pitch of 2.0mm not the standard 2.54mm for breadboard2.0mm pitch male to male pin ..