Weight Core 2,850 grams 40 x 232 mm weighs 2,850 grams and measures 40 mm in diameter by 232 mm in length. Weight Core 232 mm fits weight shell number 79-651. Used for FHS 451 chain movement chime side. Used for FHS 451 chain movement with second hand feature and/or Lyra Pendulum feature, time and chime side.