Type: Female to Male DC Power Adapter; Hole Diameter: 5.5mm; Pin Diameter: 2.1mm | Contact part is made of copper material, good conductivity and durable, easy to use, long service life | Convert the power supply with 5.5x2.1mm interface to 4.0x1.7/5.5x2.5/3.5x1.35/5.5x2.1mm power connector, so as to charge laptop etc | Suitable for laptop DC adapter, portable power source and computer maintenance, etc | Package includes: 10 x Female to Male DC Power Adapter