This International Standard specifies the technical requirements for two-flute twist drills made of high speed steel with either cylindrical or Morse taper shanks. It is applicable to drills irrespective of the manufacturing process, except the roll-forged drills. These requirements may also form the basis for the specification of special purpose twist drills as agreed between the buyer and supplier. This International Standard is not applicable to woodworking or do-it-yourself drills.