12 Pcs Square Electrical Box with Cover, 4"4" Heavy-Duty Metal Electrical Box, Metal Receptacle Electrical Boxes Cover for DIY Repair, Batch Construction, Line Upgrades, and Whole-House Wiring

Complete Set: The Set Includes 4 Pieces of 4-Inch Electrical Junction Boxes, 4 Matching Cover Plates, and 4 Double Socket Covers,8 Screws, Meeting Various Installation Needs Such as Wiring, Sockets, Switches, and More. | Standard Size: The Metal Junction Box Measures 4"4" in a Rectangular Shape, with a Depth of 1.5 Inches and a Capacity of 21 Cubic Inches. It Complies with Mainstream Standard Box Specifications and Can Be Installed and Used Immediately, Easily Adapting to the Vast Majority of Standard Installation Environments in New Construction or Renovation Projects. | Durable and Sturdy: The Junction Box and Cover Plates Are All Made of Galvanized Steel, Which Effectively Resists Oxygen and Moisture Erosion Through the Galvanizing Process. It Offers Excellent Corrosion and Scratch Resistance, Providing a Solid Guarantee for Long-Term Stable Use. | Efficient Installation: The Deep Metal Electrical Box Features 16 Pre-Cut Knockouts with Precise Hole Positions. Simply Knock Them Off to Thread the Conduit, Greatly Simplifying the Wiring Process and Saving Construction Time. | Neat and Aesthetic: The Metal Electrical Junction Box Completely Hides Internal Cables and Connection Points, Eliminating Wall Clutter and Keeping the Space Clean and Organized. Meanwhile, the Enclosed Metal Shell Effectively Isolates Wire Joints, Providing Reliable Protection for Electrical Safety.