For improved safety, each screwdriver is tested individually at 10,000 Volt for 10 seconds VDE approved Inline Hardening Process – +50% Tip Life and +100% Bar Strength Handle Material - Softer for more Comfort and still Chemical Resistant. Handle ‘Channel’ - +10% Torque Laser Marking - gives virtually Permanent Marking CNC tip machining - gives better Screw Fit increasing Torque Transfer and Reducing Wear.