For use on Bosch alternators with free wheel pulleys. For use on Audi, BMW, Ford, Skoda, Mercedes-Benz and Volkswagen. This two piece tool is ideal for dismantling and assembling the free wheel pulley whilst changing the alternator or pulley. The pulley shaft is held in place with the M10 spline bit on 1/2""D socket whilst the nut is undone using the 33 teeth union nut with 17mm spanner. For use on Bosch alternators with free wheel pulleys. For use on Audi, BMW, Ford, Skoda, Mercedes-Benz and Volkswagen. M10 Spline x 1/2""D. This two piece tool is ideal for dismantling and assembling the freewheel pulley while changing the alternator or pulley. The pulley shaft is held in place with the M10 spline bit on 1/2""D socket whilst the nut is undone using the 33 teeth union nut with 17mm spanner.