RadioShack Adaptaplug B
This plug mates with RadioShack and Enercell branded DC and AC adapters, allowing end user to select the best tip for their device and select the proper polarity. Adaptaplug B conversion size: O.D.: 4.0mm. I.D.: 1.7mm
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RadioShack
{"Package Dimensions": "1 x 1 x 1 inches", "Is Discontinued By Manufacturer": "No", "Date First Available": "April 26, 2017", "Manufacturer": "RadioShack"}