This is a set of 5 DC power male connectors. I am selling these because I have some left over from my electronic projects. They have been opened, but are unused. There are no visible rust or noticeable scratches. I cannot confirm the operation of this product due to its structure, but the ones I used had no problems. Outer diameter x inner diameter: 5.5x2.1 mm Cable hole diameter: 5mm Due to the nature of the product, returns are not accepted after use. I am also selling some other electronic project parts. If you purchase them at the same time, I will discount the shipping cost, so please consult in the comment section before purchasing. I look forward to your purchase if you understand. #DC power #Connector #Electronic project