General description Ideal tool for assembling and dismantling the freewheel pulley while changing the alternator or pulley on Bosch alternators. Technical specifications Size: Star T50 Drive: 1/2""D Length: 109mm Usage The pulley shaft is held in place with the T50 Star bit on a 1/2""D socket while the nut is undone using the 33 teeth union nut with a 19mm spanner. Star is the equivalent of Torx - 6 sided. Other information Torx is the registered trademark of Acument Intellectual Properties, LLC.