comparisons tool bit 80 is generally formed of cylindrical wire stock and includes an elongated body portion 80 a and an elongated single bit end 80 b and proximate end ears 80 c for locking the bit in the tool not shown in fig1 but generally shown in fig4 a and 4 b it was generally believed and the direction of the prior art that only a single bit could be accurately minimal for a precision tool as generally shown in fig1 4b referring now to fig1 conventional double end tool bit 85 has a body portion 85 a and a first bit end 85 b and second bit end 85 c tool bit end lengths x were generally at least about u00bd inch or 17 mm with the distance across the body flats being generally at least about u00bc inch or 8 5 mm the art was directed to a tool bit length of at least about 17 mm for an accurately mechanical hex bar stock of about 8 5 mm in construction the precision tool bit 60 of the present invention as shown in fig1 has a body portion of regular hexagonal cross section with a width of no more than about 4 mm across the flat sides of the regular hexagon and a body length y of no more than about 8 10 mm with a tool bit 60 b integrally formed at respective opposite ends of the body.