... .3mm thickness 8mm-300mm width blue,white,yellow,black,polished Hardened and tempered steel stripMaterial: ck50,ck60,ck67,ck70 ... 5mm thickness 8mm - 300mm widthSurface finished: bright,white,blue, polished, yellow, blackHardness: 40-55HRC for hardened and ... trowel, putty knives, rolling door shutter spring, steel shank, steel toe cap, steel insole, spring metal part, lawn mower blade, wiper blade ...