M4350 Masonry Box, 4-Gang, 3-1/2" Deep, 1/2 " & 3/4" KOs, Metallic

4-Gang, Non-Gangable, Masonry Box, Welded, Metallic. Depth: 3-1/2". Side Knockouts:(20) 1/2" & 3/4" Concentric KOs. Bottom Knockouts: (4) 1/2" & 3/4" Concentric KOs. Cubic Inches: 15.5".

Ensure code-ready performance and fast installs with metallic outlet and switch boxes designed for safety, bonding, and ease of grounding. Concentric/eccentric knockouts (standard 1/2" 3/4") allow bonding above or below 250 V without additional means, while compliance for use in two-hour fire-rated walls is backed by UL guide QCIT. The Groundskeeper raised ground boss features one or two #10-32 tapped holes so a 3/8" green ground screw threads securely without contacting the mounting surface, delivering a cleaner, safer, and more reliable ground connection. Ideal for commercial and residential applications requiring dependable bonding, fire-rated compatibility, and streamlined grounding.