20PCS 2.54mm Breakaway PCB Board 40Pin Male and Female Header Connector for Arduino Shield

The header worked well in my electronic project. Fit together is adequate.

Perfect

Not sure what to say, they're headers. They do what they do, and break apart easily. Fast delivery.

Used these to interface to an Arduino. Changes can be made in the future if needed to acommodate wiring changes with new header without having to modify the Arduino. I keep some empty pins on the header to secure extra grip force when header is inserted into Arduino sockets.

I used these to breakout a stepper motor driver. I used both male for motor pins and female for logic pins... The males worked flawlessly! The females were a pain. The design needs to be adjusted so there is a score between pins. Similar to the males that will aid in snapping or cutting. When I split them I used sharp nippers. I had to sacrifice the pin after the cut. Then once cut I used an xacto knife to clean the edges... Edges are not easy to get straight either... Otherwise these pins function as designed!