315 roll pins (spring tension pins) in assorted sizes with clear-view storage organizer case * Heat-treated 65mn spring steel construction to meet demands of high-stress applications * Commonly used in automotive, engine, mechanical, gun smithing and industrial applications * Includes 10 diameters 1/16" to 3/8", 11 lengths 3/16" to 2"; rust resistant black oxide finish * An outstanding value in shop hardware - 315 roll pins for price of a dozen purchased individually