... series Diameter: 1.0~50mm. Surface:bright,polishe,pickled Stainless Steel Round BarStainless Steel Square/ Flat/ Round / Triangle / Hex BarSpecification:------------------------------------------------------------------1.Standards: GB AISI2. ... Application: Widely used for manufacturing Spring, Screw, Bolt & nut, Steel mesh/coveyer belt, Shaft pin, Needle, Nail, Rope, Earphone wire, Washer, Staples ...