Seiko 4/4 Westminster & Whittington Chime Movement - Pendulum Movement - Clock Repair Parts Kit - Choose a size - Shaft Diameter: 5/16". Threaded Shaft Length 13/16". Overall Shaft Length: 1-1/8" Chimes Every Quarter Hour Then Strikes On The Hour. Runs Up To A 18" Pendulum. Automatic Night Shut Off And Volume Control. Please see below for full product description (including how to receive hands).