Thank you for viewing. This is an RS-232C 25-pin gender changer connector, manufacturer unknown. It's a gender changer, also known as an extension connector. These are unused items, leftover stock from work several decades ago. They are being sold as a set of 9, but individual sales are also possible if you wish. In that case, I'm sorry, but the unit price will be slightly higher than the set price. The following is AI-generated text. [Compatibility] Because it conforms to the RS-232C standard, it is compatible with various devices. It is especially suitable for industrial equipment and older PCs. - Quantity: 10 pieces - Connector Type: RS-232C connector - Color: Gray - Number of Pins: 25 pins - Material: Plastic and metal Thank you for viewing.