DETAIL - Contact Type: Female, Pins: 4pin, Quantity: 50 pcs, Pin spacing: 2.54mm / 0.1' , Number of Rows: Single Row, Contact Shape: Square, Degrees:180°, Straight, Long pin length: 3.2 mm / 0.126 inch DURABLE PLASTIC AND STURDY PIN - The durable plastic are perfectly matched to the sturdy pins and never fall out, the plastic have high temperature resistance perfect for solder header. GOLD PLATED WITH ANTI-CORROSION - Pin headers are fully gold plated needle, with anti-corrosion and better contact. The brass pins have better conductivity and perfectly fit for female socket. APPLICATION - Used for PCB, Arduino prototype shield, Raspberry pi ( NANO / GPIO extender / PICO / ZERO ), Machine, SMD led strip, Breadboard, Soldering header pins, Electronic circuit, etc. CHOOSE THE SIZE OF OPTION - You need to count out how many holes you need and choose the size of option. You also can to snap them off what size if needed, Please see Picture 6.