Material grade: CK45, CK50,, CK67, CK70, CK75, 65Mn, 3Cr13,50CrV4 Thickness: 0.15mm to 3.0mm, tolerance max +/-0.01 mm Width: 6.0mm to 600mm tolerance max +/-0.1mm Finish: nature, bright, grey, polished Hardness: 21-28HRC for cold rolled process, 30-52HRC for hardened&tempered process,below 20HRC for anneal process, according to user`s requirements Edge: slit, round, square Packing: each bundle with anti-rust paper and light oil then wrapped in plastic film with metallic pallet and put in 20ft container for standard sea worthy Standard: GB, JIS, DIN Application: roller shutter spring, bandsaws,spring clips,construction tools, filler knife,agriculture tools etc. Flat surface and uniform hardness Each bundle with anti-rust paper and light oil then wrapped in plastic film with metallic pallet and put in 20ft container for standard sea worthy