US Standard Electrical Metal Junction Box Galvanized Steel 4" X 2" Rectangular Drawn Utility Boxes 1.6mm 1-7/8" Deep Handy Boxes

Authoritative Electrical Certification (Certified Safety): Authoritative industry certification marks cETL clearly die stamped on the enclosure surface, fully complying with the National Electrical Code (NEC) and Canadian Electrical Code (CEC) for construction in Canada and North America for hassle free project acceptance.

Heavy duty Galvanized Steel Material: The housing is made of high-strength galvanized steel through stamping. It has excellent corrosion resistance, rust prevention, fire resistance and explosion-proof performance, which can protect the internal wiring for a long time.

High-precision screw mounting holes for a tight, seamless fit during installation. The edge screw mounting ears feature a thickened design with fine built-in threads, perfectly compatible with standard 2-Gang switch plates, outlets or Mud Rings. They resist thread stripping even after frequent long-term plugging and unplugging.

Pre-installed Ground Screws: The prominent row of green ground terminals (marked with GR) in the middle are all pre-installed.

Extra-large internal space (21 Cu In capacity class) Stamped at the bottom with GR 21 Cu large-capacity design, it provides ample space for internal wires to dissipate heat and turn around, avoiding overheating risks caused by crowded conductors. It is ideal for housing multiple sets of wires or smart switch modules.

Multi-functional Knockouts for Flexible Wiring Pre-cut knockouts of various sizes (including common pipe diameters such as 1/2" and 3/4") are scientifically arranged around and at the bottom of the enclosure. Workers can easily knock them out without professional tools. It allows multi-directional entry of multiple conduits at the same time, greatly improving construction efficiency.