Pair of brass 5 prong winding keys - odd sizes 3 (3.0mm), 5 (3.4mm), 7 (3.8mm), 9 (4.2mm), and 11 (4.6mm), and even sizes 4 (3.2mm), 6 (3.6mm), 8 (4.0mm), 10 (4.4mm), and 12 (4.8mm). American made, sized on the American scale. 

Measure your winding arbor, or ask us for help to determine the right key size for your anniversary clock.