Stahlwille series 40 hex sockets with 14in square drive in metric sizes are made from hpq high performance steel and are chrome plated hpq sockets are manufactured from selected tough steel alloys for an extremeley high load capacity with exceptionally thin rings and walls they are free of cadmium and are therefore suitable for use on titanium alloy parts and titanium fasteners such as those used in the aerospace industry where safety is a crucial factor the sockets are equipped with as drives