Outlet Box, Pre-Galvanized, Silver, 21 Cu.In Capacity, Square, Knockout Cable Entry, 1/2 In (Side);1/2 In (End);3/4 In (Bottom);1/2 In (Bottom) Knockout Size, 17 Knockouts, Wall or Ceiling Mount, 1 Outlet, 4 In Length, 4 In Width, 1-1/2 In Height, 62.5 LB/100