Thank you for viewing. DC Jack Plug Conversion Adapter Outer Diameter 5.5mm / Inner Diameter 2.1mm ⇒ Outer Diameter 4.8mm / Inner Diameter 1.7mm No Center Pin Laptop Mobile Power Supply Charger Router etc. ■ This product can be directly inserted into a 5.5mm (outer diameter) x 2.1mm (inner diameter) standard power interface for conversion. Complete all interfaces with a single power cable interface. ■ Outer Diameter 5.5mm / Inner Diameter 2.1mm ⇒ Outer Diameter 4.8mm / Inner Diameter 1.7mm No Center Pin ■ Can be used for converting various power adapters such as laptops, PCs, razors, routers, and broadband equipment. ■ Please be sure to check the size before ordering to ensure there are no mistakes. ※ Please note that this is a bulk product, so there is no packaging or instruction manual.