A connector for a concrete structure including two generally flat plates connected together along one edge to form an elongated structure having substantially an L-shaped cross section. One plate has an opening sized to allow unset concrete to flow through the opening and to hold the plate firmly within the concrete when it is set. When this plate is held within the concrete, the other plate protrudes from the concrete and is available for connection with another such connector by direct welding or clamping of the two plates together.
