Steel City square electrical box. Designed with 1/2" knockout slightly off-center from the 3/4" so the tangs of 1/2" locknut bite into the metal box. Steel, 4" W x 4" H x 1-1/2" D, 21 cu in. UL (Underwriter's Laboratories) listed. No. 52151B1234: Mount Type: Bracket, Width: 4", Height: 4", Depth: 1-1/2", Volume: 21 cu in, Knockouts: (11) 1/2", (6) 3/4", Material: Steel, Metallic/Non-Metallic: Metallic, Construction: Welded, Gangable: No, Color: Metallic, UL Listed: Yes, Pkg Qty: 1 No. 52151DV12: Mount Type: Bracket, Width: 4", Height: 4", Depth: 1-1/2", Volume: 21 cu in, Knockouts: (11) 1/2", (6) 3/4", Material: Steel, Metallic/Non-Metallic: Metallic, Construction: Welded, Gangable: No, Color: Metallic, UL Listed: Yes, Pkg Qty: 1 No. 52151MSN: Mount Type: Bracket, Width: 4", Height: 4", Depth: 1-1/2", Volume: 21 cu in, Knockouts: (7) 1/2", (2) 3/4", (2) Cable, Material: Steel, Metallic/Non-Metallic: Metallic, Construction: Welded, Gangable: No, Color: Metallic, UL Listed: Yes, Pkg Qty: 1
