I needed this tool kit to replace an alternator pulley and it seems like the right tool bits (heads) came in this kit at 10 and 17 mm). To my surprise, the 10mm bushing broke when I started applying force to turn the alternator shaft. Also, the broken part was stuck in the pulley - which meant I couldn't start the car as the pulley would be unbalanced and potentially break. generator bearing. Luckily, after a few hours of dancing, I managed to remove the piece with a makeshift wire hookโฆ