Female Spring Bar Assortment consists of 60 pieces of female spring bars with lengths from 9 to 20mm and a body diameter of 1.80 mm. Female spring bars are used on a variety of antique watch cases, where the case lug has a pin, instead of a hole. Set includes numbers 67-46400-09, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20 mm. Refills are available.