This is a Lenovo square-to-DC plug adapter cable for PC AC adapters. It converts from a Lenovo square connector to a DC plug with an outer diameter of 5.5mm and an inner diameter of 2.5mm. For converting Lenovo slim tip AC adapters. Photos 4-5 are for reference only. The AC adapter is not included. Photos 1-3 are the items for sale. I was using this conversion connector to charge my PC for telework, but I no longer need it because I replaced my PC and the connector shape is different. Jack (female): Lenovo square plug (inner dimensions 11mm x 4.5mm) DC plug (male): Outer diameter 5.5mm - Inner diameter 2.5mm