The invention is directed toward a tool assembly for optionally operating a tool body independently or in combination with a storage holder for polygonal shaped tools, such as a L shaped hex key. The tool assembly includes a tool main body that can act as a tool itself. The tool main body may comprise a housing, an adjustable securing mechanism, and a control member. The adjustable securing mechanism is mounted in the tool main body housing and is operatively connected with the control member. The adjusting mechanism is configured to accept and secure a tool of different sizes and shapes. The control member is rotatable to bias the adjustable securing mechanism to rotate around an axial direction in the housing so that the adjustable securing mechanism is moved in a manner to either secure a tool or release a tool.