Weight Core 3,300 grams 40 x 264 mm weighs 3,300 grams and measures 40 mm in diameter by 264 mm in length. Weight Core 264 mm fits weight shell number 79-653. Used for FHS 1151 chain movement with wooden pendulum or lyre pendulum below 165 mm in diameter chime side. Used for 1151 movement with second hand feature and / or Lyre pendulum with bob diameter 165 mm and greater for time and chime side.