... /dullsoft,hard···as requestuse for various kinds of fastener manufacturing precision screws,bolts and nuts ,rivet,nail.stable,pins1.0-7.0302 ... ,304,321,631J1,347Spring wirebright/dullharduse for rolling various precision springssprings0.11-16.00304,304L,AISIL304L,302,304H,321,316 ...