These tools are accessories designed to provide increased reach for sockets when working with fasteners in recessed or obstructed areas. They bridge the gap between a socket wrench and the fastener, allowing access where the wrench alone cannot reach. Consider, for example, accessing a bolt deeply set within an engine compartment.
The value of these implements lies in their ability to facilitate efficient and effective work in confined spaces. This saves time and effort by avoiding the need for disassembly of surrounding components. Their historical development reflects the increasing complexity of machinery and the corresponding need for specialized tools to service them.
