Hollow taper shanks with flange contact surface – Part 2: Hollow taper shank type B; Dimensions and design
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2011

Hollow taper shanks with flange contact surface – Part 2: Hollow taper shank type B; Dimensions and design
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 04/01/2011