450 New Watch Band Spring Bars. This is a new assortment of 450 extremely thin double flange spring bars. Also included are the measurement numbers on each compartment. The plastic storage container measures approximately 4 1/4" x 2 1/2" x 9/16" (108 x 57 x 14 mm). You receive: Twenty five 7 mm (0.27559") spring bars. 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. Fifty 18 mm (0.70866") spring bars. Fifty 19 mm (0.74803") spring bars. Twenty five 20 mm (0.78740") spring bars. Twelve 21 mm (0.82677") spring bars. Fourteen 22 mm (0.86614") spring bars. Fifty 23 mm (0.90551") spring bars. Fifty 24 mm (0.94488") spring bars.