Blade is Differently Hardened and Tempered to Resist Wear, Bending and Meet High Torque Requirement, Higher the Hardness Higher is Wear Resistance, Hardness on Tip: 55 to 58 HRC, Steel Gives Spring Effect Also, tester, taparia line tester, line tester, long screw driver, taparia tester, taparia screwdriver, electrician hand tools.
