Prefabricated boxes These prefabricated steel outlet boxes are available in 4s (4-in. square) and 5s (411/16-in. square) models. Constructed from galvanized steel, the boxes feature popular knockout configurations. Additional product feature include: an adjustable back support that is centered to ensure correct placement and support for studs up to 6 in. deep; an extra-long green 10-in. pigtail (12
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