Seiko Quiet Step Battery Clock Movement - Clock Repair Kit - 3/16 in. Threaded Shaft Length Quiet step movement which means it has a quiet second hand motion instead of a loud ticking. Not completely silent. Case Size: 2-1/8 inches wide x 2-1/8 inches high x 1/2 inches deep. Shaft diameter is 5/16". Threaded Shaft Length: 3/16". Overall Shaft Length: 1/2". Please see below for full product description (including how to receive hands).