Rotary Pendulum Drive The rotary pendulum drive mechanism supports and drives a 2 3/4" diameter rotary gold finished pendulum from the bottom. This mechanism can be combined with almost any quartz movement to create an anniversary or novelty clock of your own design. Dimensions: assembled unit: 2 3/4" W x 3 3/4" H 3 Year Warranty Operates on 1 "AA" cell battery (not included) Gold finish rotary pendulum Drives only the rotary pendulum Price includes pendulum drive mechanism and rotary pendulum