Spring Bars, Extra Thin 10 sizes 20 each This is a new assortment of 200 extra thin spring bars. It has 10 plastic storage vials with lids. Each vial measures approximately 36 x 8 mm (1 3/8" x 5/16"). Also included are the numbers 1-10 to mark each vial. 20 spring bars measuring approximately 1/4" 20 spring bars measuring approximately 5/16" 20 spring bars measuring approximately 3/8" 20 spring bars measuring approximately 7/16"