Up for sale is a  Ducommun M8-412K301 8 way coaxial switch. This is a very high quality unit designed for military/ space applications. Its been fully tested and works fine. This is a12v model, is rated up to 18GHz and is fitted with SMA connectors. Back-emf diodes have been soldered to the contacts, for  +ve connection to the common pin. If you want to use common as ground and switch with +ve, simply remove the diodes or reverse them. It also comes with a L bracket to mount from the back, if required. For more info, please copy and paste the link below into your browser;

http://www.ducommun.com/productsinfo28f3.html