... width blue,white,yellow,black,polished Hardened and tempered steel stripMaterial: ck50,ck60,ck67,ck70,ck75, 50CrV4, 60Si2Mn ... 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 steel trip