Weight Core 2,000 grams 40 x 232 mm weighs 2,000 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 241 Chain movement both time and strike. Used for FHS 451 Chain movement for time and strike. Used for FHS 451 Chain movement with second hand feature and/or Lyra pendulum feature strike side. Used for FHS 791 chain movement time side.