Snap In Alarm Quartz Movement with Step Seconds Movement measures 55.6 mm (2-3/16") (W) x 55.6 mm (2-3/16") (H) x 15.9 mm (5/8"). Alarm hand measures 6.2 mm (1/4”) in diameter where the hand fits to the movement. Hour hand mounting diameter is 4.5 mm (11/64”), minute hand mounting diameter 2.8 mm (7/64”). Overall shaft length is 8.4 mm (21/64”). The movement comes complete with a set of 4 hands, minute hand length 20.0 mm (25/32”) (hour & minute black stick with green luminous, red sweep, yellow alarm.)