This International Standard specifies the dimensions of parallel shank countersinks for angles 60°, 90° and 120° inclusive. It specifies dimensions in metric units only, these being regarded as the only recommended dimensions in the future, for countersinks with cutting diameters in the range 8 to 25 mm. The dimensions apply only to tools made from high speed steel. However, if the method of production allows, the shanks may be manufactured from a suitable alternative material, such as a carbon steel. Unless otherwise indicated, the countersinks will be right-hand cutting. Morse taper shank countersinks are the subject of ISO 3293.