Attributes . Outlet Box, Pre-Galvanized, Silver, 29.5 cu.in Capacity, Square, Knockout Cable Entry, 1/2 in (Side);3/4 to 33/64 in (Side);1/2 in (End);3/4 to 33/64 in (End);1/2 in (Bottom);3/4 in (Bottom) Knockout Size, 16 Knockouts, Wall or Ceiling Mount, 1 outlet, 4-11/16 in Length, 4-11/16 in Width, 1-1/2 Height, 0.89 lb/EA . Names