[ITEM SIZE]: The spring pin assortment set includes 435-piece spring steel pins, commonly metric sizes - M1.5 M2 M2.5 M3 M5 M6 dowel roll pins, wide range of sizes [HIGH QUALITY]: Roll pin set is made of high quality Carbon Steel, and strong, with good fastenning effect. Black oxide finish to resist rust and [PRODUCT FEATURE]: These hollow fasteners expand upon exertion,two ends have chamfer, for the positioning, connecting and fixing between the parts [WIDE APPLICATION]: The slotted spring is useful in industrial production and home improvement, such as fixing mechanical installations, repairing electrical appliances, cars, trucks and boats, etc., Weight: 0.79697107713 pounds, Manufacturer: Aboiled