Snap-In Clock Movement With Threaded Shaft - Choose a Size Replacement Movement For Clocks With Snap-In Housing. Threaded shaft length: 1/4". Overall shaft length: 1/2" Case Size: 2-1/8 inches wide x 2-1/8 inches high x 5/8 inches deep. Shaft Diameter Is 5/16 inch (8mm). Includes all mounting hardware and a metal wall hangar. Please see below for full product description.