OwnMy 4 Inch Square Electrical Junction Box, Metal Welded Electrical Boxes

Package Includes 4 x Square Electrical Boxes, measures 4"L x 4"W and about 2-1/8" Depth, has a capacity of 30.3 Cubic Inches, accommodates many electrical wires and devices, suitable for most 4 Inch electrical boxes. | 16 Knockouts: Side has 8PCS 1/2" Knockouts and 4PCS 1/2" & 3/4" Knockouts; Bottom has 2PCS 1/2" Knockouts and 2PCS 1/2" & 3/4" Knockouts; they are easy to remove for installation, connection or welding of various electrical outlet boxes and cables. | Made of sturdy galvanized steel, this set of electrical junction boxes is dust & rust proof, corrosion-resistant and heat-resistant, can be used for a long time without deforamtion or damage, it is acceptable in 2-hour fire rated walls. | Designed to provide sufficient space and protective housing for electrical connections, wires and various components, avoids overcrowding and disorder of electrical cables, helps to manage them orderly & properly, and use electrical box safely and stably. | This metal junction box is used to weld a electrical box used for installing receptacles, switches, sockets or fixtures in walls or ceilings, widely used on home renovations, building constructions, basements, garages and outdoor charging stations with fire prevention requirements.