Stahlwille 734/80 Square drive shell 24.5x28 Insert / Shell Tools • Output square drive in accordance with DIN 3120 • Long-term loading of the input and output square drive is in accordance with DIN EN ISO 6789:2003 • In compliance with DIN EN ISO 6789:2003. The limits must not be exceeded if larger torque wrenches and tool holders are used. For additional information on the Stahlwille 734/80 Square drive shell 24.5x28 please see below.