This document specifies the design and dimensions of the 29 mm screw finish with three (3) thread starts for flat waters and non-carbonated beverages. This document applies to finishes designated as PET finishes 29/25 (12,6). The dimension (12,6) is the height in millimetres from the top of finish to the bottom of the support ledge. This finish can be used for aseptic filling and filling which utilizes nitrogen pressure. The internal overpressure does not exceed 1 bar maximum). This finish is designed to accept a tamper evident plastic closure only including those with an attachment feature.