ISO 235:2016 specifies the dimensions of the following three types of drills:
a) parallel shank drills, stub series,
b) parallel shank drills, jobber series,
c) Morse taper shank drills.
It comprises, for each type of drill mentioned above, three tables giving, respectively:
a) the dimensions in millimetres,
b) the dimension in inches,
c) the corresponding lengths, in millimetres and in inches, set out as functions of diameter steps.