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