Attributes . Outlet Box, Pre-Galvanized, Silver, 21 cu.in Capacity, Square, Knockout Cable Entry, 1/2 in;3/4 in Knockout Size, 17 Knockouts, Wall or Ceiling Mount, 1 outlet, 4 in Length, 4 in Width, 1-1/2 in Height, 71.5 lb/100 . Names