Optimised grip for fingertip control & final torque down power, Certified & approved by the world renowned VDE institute of Germany, Each screwdriver is tested to 10, 000v for the complete assurance of safety, GS (Geprüfte Sicherheit) safety marked, Non roll handle design Â- Specifically designed to stop the screwdrivers rolling off non flat surfaces, Contoured blade insulation for enhanced terminal access, C.K tools are guaranteed for life against imperfect materials or workmanship., Normal wear & tear or damage caused through inappropriate use is not covered.