Stahlwille 540a HD Crow Foot Spanner: Stahlwille 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. Please refer to more detailed information on the Stahlwille 540a HD Crow Foot Spanner below.