Alternator Socket with 33 teeth for mounting the V-belt pulley (slip clutch pulley) at the alternator (manuals call it a generator).
Used for removal and installation of pulley with free-wheel. Use with T50 TORX. 17MM outside dia. Length 30mm.
The Porsche Number for this tool would be 2592 or PNA 721 048. Group 27 Porsche Bulletins.