... 9AInterior diameter:1.7mmExternal diameter: 4.8mm Compatible laptop models: HP/COMPAQ P/N: 325112-001, 324816-003, ... , 286755-001, 287515-001, ACCOM-C16, 432309-001Compatible Laptop Models: Compaq Presario 2100 Series :2100AP, 2100CA, 2100LA, 2100US, 2101AP, ... 2167EA, 2169EA, 2170US, 2172EA, 2173EA, 2175EA, 2175US, 2190USCompaq Presario 2500 Series :2500AP, 2500LA, 2500AP, 2510AP, 2510EA, 2510LA, ...