2400 New Double Shoulder Spring Bars. This is a new assortment of 2400 spring bars. These nickel plated brass spring bars are used to attach watches to watch bands. They come in a storage container that measures approximately 8 3/4" x 4 1/2" x 1 1/4" (222 x 114 x 32 mm). You receive: Two hundred 6 mm (0.23622") spring bars. Two hundred 8 mm (0.31496") spring bars. Two hundred 10 mm (0.39370") spring bars. Two hundred 11 mm (0.43307") spring bars. Two hundred 12 mm (0.47244") spring bars. Two hundred 14 mm (0.55118") spring bars. Two hundred 16 mm (0.62992") spring bars. Two hundred 18 mm (0.70866") spring bars. Two hundred 19 mm (0.74803") spring bars. Two hundred 20 mm (0.78740") spring bars. Two hundred 22 mm (0.86614") spring bars. Two hundred 25 mm (0.98425") spring bars.