The Knipex TwinKey has 10 keys which fit into all established locking systems, as well as exotic locking systems. Whether it is heating and air-conditioning units, gas and water supply and shut off systems, or access to a fuse box, the easy-to-grip-and-turn TwinKey fits them all. The TwinKey is an eight-armed spider wrench and consists of two cross keys cleverly connected by a magnet. When unclamped, they remain connected to each other by a stable stainless steel wire, so they cannot get lost.