Reeling shutter spring steel strip 1) material: 50# 65Mn2) Color: black,blue, bright,yellow3) finished:polished, tempered and hardened, round edge4)Specificaton: thickness: 1.2mm 1.3mm 1.4mm 1.5mm width: 40mm 45mm 50mm 55mm 60mm Lengthe: 3.5m 4m 4.5m 5m 5.5m 6m ,according to your requirement5) Packing : oiled, plastic film,carton, pallet If you have any other requirements, please kindly feel free ...