High grade stainless 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 use of stainless tools with stainless steel fasteners prevents the cross contamination of metal preventing rust from a galvanic process vacuum ice hardened f