What is this component called?

What are the pins/connectors called (and a link to them on something like digiey or mouser) that you can cut to size (amount of pins) and solder onto a PCB and that also fits into a solderless breadboard? I've seen them in some videos before, but I cant think of any off the top of my head.

Hopefully that description is adequate to know what I mean.

they're just .1" headers. http://www.digikey.com/product-detail/en/TS-132-T-A/SAM1112-32-ND/1105462

Also female ones exist:

http://www.robotshop.com/break-away-female-headers.html

Not really breakaway, but can easily be cut to size.

International sellers sell this stuff cheaper, but it can take 2 weeks and usually does.

http://www.taydaelectronics.com/40-pin-2-54-mm-single-row-female-pin-header.html http://www.taydaelectronics.com/40-pin-2-54-mm-single-row-pin-header-strip.html

I think OP might have meant 0.025" square pins? Such as http://www.dipmicro.com/store/HEADS40G

The round machined ones are nice for mating with machined socket pins. http://www.dipmicro.com/store/HDR40X1FM

Otherwise can be a looser than intended fit.

CrossRoads: I think OP might have meant 0.025" square pins? Such as http://www.dipmicro.com/store/HEADS40G

The round machined ones are nice for mating with machined socket pins. http://www.dipmicro.com/store/HDR40X1FM

Otherwise can be a looser than intended fit.

IE not a fit at all! The smaller header pins are round and 0.019" in diameter.

The larger square pins (0.025" sq) do not fit into smaller female headers, note, so you cannot mix-and-match. Also thin component wires (such as signal diodes) are too thin for the larger female headers - proper hook-up wire sets with pins on the ends fit the larger headers usually. The Arduino headers are the larger sort (which are generally preferred - the smaller sort can be used as IC sockets though).

There's a saying about square pegs and round holes that applies here!