Seiko Clock Movement Quartz Square Spade Black Hand 1/2" Kit Case size: 2-1/8"W x 2-1/8"H x 1/2"D Shaft Diameter: 5/16" (8mm) Maximum dial thickness of 1/2" Requires: 1 'AA' battery (not included) Includes free 2 1/2" set of hands with second hand