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There are various types and specifications of steel junction boxes.
Square box:These boxes come in two sizes: 4-inch and 4 11/16-inch and can be of drawn or welded construction. Square boxes are generally mounted in the wall for receptacles or devices, or used as a wiring junction box. They can also be ceiling mounted to be used as a junction box or to mount lighting fixtures.
Octagon box:Octagon outlet boxes are named for their shape and are typically ceiling mounted to wire lighting fixtures. Extension rings provide a means for adding additional cubic capacity or as an outlet box for surface conduit. Boxes may be used in the installation of lighting fixtures. Combination screw heads provide for faster installation.
handy box:Utility boxes, also called handy boxes, are used for convenience outlets, switch boxes or small junction boxes. They are popular for surface-mounted wiring. Extension rings provide a means for adding additional cubic capacity or as an outlet box for surface conduit.