Hubbell-Raco 911-2 4" Square Alarm Box, Red, Welded, Depth: 3-1/2", Metallic

4" Square, Red Alarm Box, Welded, Metallic. Depth: 3-1/2". Side Knockouts: (12) 1/2" - 3/4". Bottom Knockouts: (4) 1/2" - 3/4". Cubic Inches: 40.5". UL Listed for Use in 2 Hour Fire Rated Walls.