Gikfun 1 x 40 Pin 2.54mm Single Row Breakaway Male Pin Header for Arduino (Pack of 10pcs) EK1530 Needle length 17MM, about 7.6MM on each side 40 Pin Straight Header Pitch 2.54mm Pack of 10pcs Pitch 2.54mm Needle length 17MM, about 7.6MM on each side This pin header kit is an ideal connector for the PCB board and circuit board, used widely in the computer and breadboard.