These compact USA MADE "AA" battery powered high torque movements were designed specifically for use with today's new larger clocks. They are the most powerful quartz movements on the market today, and they were designed to solve one of the primary assembly problems that confronts everyone making larger clocks-hour and minute hand spacing! All of the high torque movements on the market today share the same problem-they are just more powerful versions of regular movements designed to accommodate regular size hands.