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.