Set of 3 Finish Shells for Grandfather Clocks Set of 3 Brass Finish Weight Shells, for decorative purposes only. These weight shells are not for use with mechanical (weight driven) clock movements. If you are looking for weight shells to be used with a weight driven mechanical movement, then this is not what you want, as weight shells for weight driven mechanical movements require weight shells that are specific to the particular clock movement that you have. These decorative weight shells can be used with battery operated pendulum drive and our AZPLYRE41 large pendulums. 9-1/4 long by 1-5/8 diameter. A 34 chain with hooks is included with each weight shell.