ITEM NAME:10x DC Power 4.0x1.7mm Male Plug to 5.5x2.1mm Female Jack Adapter Connector Kit Description: Fits for converting the 5.5x2.1mm port power into 4.0x1.7mm port power One end: 4.0 (out side Diameter) x1.7 mm (inside Diameter) male One end: 5.5x2.1 mm female Demension: Approx.40x11x11mm/1.57x0.43x0.43inches Material: Plastic, Metal Color: Black Package Includes: 10Pieces DC Power Connector.One end: 5.5x2.1 mm female. 10Pieces DC Power Connector. Fits for converting the 5.5x2.1mm port power into 4.0x1.7mm port power. Color: Black.