450 New Watch Band Spring Bars. This is a new assortment of 450 spring bars. This assortment has 18 different sizes of popular stainless steel spring bars. It makes finding the right spring bar much easier. Spring bar sizes included are 8-24 mm. Comes with a plastic container that measures approximately 7 1/2" x 3 13/16" x 7/8" (190 x 96 x 23 mm). You receive: Twenty five 8 mm (0.31496") spring bars. Twenty five 9 mm (0.35433") spring bars. Twenty five 10 mm (0.39370") spring bars. Twenty five 11 mm (0.43307") spring bars. Twenty five 12 mm (0.47244") spring bars. Twenty five 13 mm (0.51181") spring bars. Twenty five 14 mm (0.55118") spring bars. Twenty five 15 mm (0.59055") spring bars. Twenty five 16 mm (0.62992") spring bars. Twenty five 17 mm (0.66929") spring bars. Twenty five 18 mm (0.70866") spring bars. Twenty five 19 mm (0.74803") spring bars. Twenty five 20 mm (0.78740") spring bars. Twenty five 21 mm (0.82677") spring bars. Twenty five 22 mm (0.86614") spring bars. Twenty five 23 mm (0.90551") spring bars. Twenty five 24 mm (0.94488") spring bars.