rolling door spring steel strip :1)Grade:CK50,CK60,CK67,CK75,C75Cr1,60Si2Mn,50CrV42)Thickness:0.15-2.5mm(tolerance:+/-0.01mm)3)Width:8-260mm(tolerance:+/-0.1mm)4)Surface:Blue polished,grey5)Edge:both round edge, slit edge,square.6)Application :rolling shutter door,roller door.
Products: rolling door hardware,
rolling duffel bag