... .5mm 4.External Diameter: 5.5mm SpecificationReplacement Laptop adapter for Thinkpad 16V 3.5A AC AdapterInput: AC100-240V (worldwide use)Output: DC16V ... , 02K6545, 02K6548, 02K6549, 02K6550, 02K6553, 02K655Fit Laptop ModelThinkPad 240, 310, 360, 380, 385XD, 390, 390E, 385XD, 770, ThinkPad 600, 600E, 600X ...