The Global Specialties Quick Test (QT) solderless breadboards offer expandable, reusable breadboarding areas that bring ideas from conception to a working circuit quickly and conveniently. The QT series offers a versatile system that can be used for any kind of analog or digital circuit design or experiment. Global Specialties' unique molded tab and keyway construction allow for unlimited circuit size and molded-in mounting holes permit each socket to be mounted from either the front or rear of the socket. Each socket is made of high impact plastic and gold plated phosphor bronze contacts for the highest quality circuit connections. All QT breadboards come with a heavy-duty Mylar backing to prevent short circuits.