... 300mm width blue,white,yellow,black,polished Hardened and tempered steel stripMaterial: ck50,ck60,ck67,ck70,ck75, 50CrV4, 60Si2Mn,AISI420 ... plaster trowel, putty knives, rolling door shutter spring, steel shank, steel toe cap, steel insole, spring metal part, lawn mower blade, wiper blade ... , hardness and elongationGood tolerance for thickness controlledColoured Tempred steel strip 50CrV4 alloy spring ...