... , car wheels, cover platerstensil strength:1100 to 2000 N/mm2Tempered spring steel stripMaterial grade: c50,c55,c60,c67,c70,c75 Thickness: 0 ... ,polished,nature,grey,black Hardness: 40-55HRC for hardened and tempered treatment. Edge: slit, round, square edge Tensil stength: 1100-2000N ... /mm2 Packing: each bundle with anti-rust paper and light oil then wrapped in plastic film and put in 20ft container ...