Hubbell-Raco 911-9 4" Square, Red Alarm Box, Welded, Depth: 1-1/2", Metallic

4" Square, Red Alarm Box, Welded, Metallic. Depth: 1-1/2". Side Knockouts: (8) 1/2" & (4) 1/2" & 3/4" TKO (eccentric) . Bottom Knockouts: (3) 1/2" & (2) 1/2" & 3/4" TKO (eccentric) . Cubic Inches: 21.0". UL Listed for Use in 2 Hour Fire Rated Walls.