We are a manufacturer specializing in exporting various steel strip. We accordingly make the following offer: 1) Width:40mm to 240mm 2) Thickness: 0.3mm to 2.50mm 3) Material: C50, 65Mn,CK67,CK70etc 4) Tolerance: width +/-0.05,thickness+/-0.02-0.07 5) Surface treatment: white, yellow, blue, grey, black, polished, unpolished, etc 6) Apliactions: rolling shutter springs 7) Edge: rounded, slitted, etc 8) Hardness:40-52HRC 9) Packing: Standard packing for seaworthy Pls contact Grace sale-4@liangyusteel dot com