Wiha 28171 - Drive-Loc VI Metric Nut Driver Blades VI 5.5. High alloy CVM steel, through hardened, hard chrome finish. Over all blade length 150mm/5.9. Blades fit all Drive-Loc VI handles.
CVM or Chrome-Vanadium-Molybdenum steel is a special, high strength, high performance alloy. Chromium improves wear resistance, hardness and corrosion resistance. Vanadium also improves the grain structure for a tougher tool. Molybdenum improves impact resistance as well as increases tensile strength and elasticity to prevent tool breakage and snapping.
WARNING: Cancer and Reproductive Harm—www.P65Warnings.ca.gov