High grade steel hex key set with weras patented hex plus profile this enables 20 more torque to be applied without damaging and rounding out the socket screw often with a damaged screwhead these hex keys will undo the screw where others fail made from round bar with machined ends for a precision fit and extra strength the thermoplastic sleeve makes these keys very comfortable during use especially over long periods and in cold conditions high corrosion protection due to the blacklaser s