ISO 2250:2017 specifies the dimensions of cylindrical shank socket reamers and taper shank socket reamers manufactured to produce self-holding taper sockets for self-holding taper shanks of the following designations, and which are in accordance with ISO 296: - metric tapers no. 4 and no. 6; - Morse tapers no. 0 to no. 6 inclusive. NOTE Unless otherwise stated, these reamers are right-hand cutting.