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Adapter: converts 5.5x2.1mm female socket to 5.5x2.5mm male plug, plug and play, easy to use. Usage: Fit for small electronics projects and CCTV applications. Female tip size: 5.5mm outer diameter and a 2.1mm inner hole diameter. Male tip size: 5.5mm outer diameter and a 2.5mm inner hole diameter. Durable Material: Internal copper connection, external high temperature resistant plastic shell, and the contour of the shell makes it easier to insert and remove.