... CQ21325 Center pin diameter: 2.5mm Fit for laptop models:Compaq Presario: 1000, 1010, 1020, 1030, 1065, 1070, 1072, 1075, 1080, 1090 ... , 18XL483, 18XL484, 18XL485, 18XL580, 18XL581, 18XL583, 18XL584, 18XL585, 18XL586, 18XL590, 1800, 1805, 1810, 1825, 1827, 1830, 1900, 2100, 2101, 2102, 2103 ...