The Wiha 21103 is a switch cabinet key of zinc diecast with an adapter for 1/4" bits on securing chain. These control cabinet keys are used for limiting access to control cabinets and shut-off systems that supply electricity, natural gas, and electricity. They are for use with air conditioning and ventilation systems, shutoff valves, and in water main supply systems. It is used for applications with all common switch cabinets and locking systems for gas and electricity supplies.