RJ45 crossover adapter. RJ45 male to female. Convert any standard RJ45 patch cable into an RJ45 crossover cable. Connecting 2 PC to share harddisk. RJ45 crossover adapter. It converts any standard RJ45 Ethernet patch cable into an RJ45 Ethernet crossover cable. Features 1>Easy to use with impact design. 2>Carry fewer cables and save space 3>Handy for network maintenance and testing 4>Compatible with Gigabit and 10/100 Ethernet 5>Coneecting 2 computers together without an HUB 6>Molded hybrid casing providing both male and female. An very convenient and useful tool for network technicians.