Trigger & Timekeeping Replacement Quartz Clock Movement - Clock Repair Kit - Choose A Size Replacement Movement For Train, Bird, Cuckoo, 16 Melody And Many Other Sound Making Clocks. Shaft Diameter: 5/16". Threaded Shaft Length: 1/4". Overall Shaft Length: 9/16". 3" Lead Wires For Attachment To Sound Module Wires. Rear Hand Set Knob For Setting The Time. Requires 1 'AA' Battery, Not Included. Includes All Mounting Hardware.