outlet box steel box switch box electrical box

Supply all kinds of outlet boxes( outlet box, steel box, electrical box, switch box, square box, octagon box, handy box, device box) with UL.
1. Are used in branch circuit wiring to splice wires.
2. Accommodate wiring devices, such as switches and receptacles.
3. Most may also serve as fixture supports.
4. Provide excellent protection for wiring system or devices.
5. Must be closed with a cover, light fixture canopy or wallplate.
6. Permit access to conductors for maintenance.
7. Allow for branch circuit runs.
8. Provide two-hour fire rating for 4x4 or smaller wall opening.
Please connect me for the recently catalogue.