Snap In Alarm Quartz Movement with Step Seconds 1/8" Movement measures 55.6 mm (2-3/16") (W) x 55.6 (2-3/16") (H) x 15.9 mm (5/8"). Movement is supplied with a complete set of hour, minute, seconds and alarm hands for a 609.6 mm (2') dial. Alarm hand measures 4.8 mm (3/16”) in diameter where the hand fits to the movement. Hour hand mounting diameter is 3.2 mm (1/8”), minute hand mounting diameter is 2.4 mm (3/32”). This movement is for dials up to 3.2mm (1/8") thick and have an overall shaft length of 4.8mm (3/16").