AOP Precast produced fixing socket with cross pin and nail plate transfer forces directly into the concrete without additional reinforcing steels. The fixing socket with cross pin and nail plate did not need plastic nail plate. The cross pin anchors itself into the concrete by means of form closure. The required concrete compressive strength is at least 25 N/mm². Forces are transferred via the cross pin. No additional reinforcement is necessary. We recommend fixing socket with wavy end only for fixings, for which a general technical approval is not necessary.