1Fitment: The alternator pulley drill bit kit is replacement for Bosch alternators, replacement for Peugeot, replacement for Ford, and cars with 33 teeth spline hole. 2Parameter: The inner diameter of this spline tool is 12mm, the outer diameter of this spline tool is 20mm, the 33 teeth part length is 30mm, and the drill bit length is 75mm. 3Function: The two part splinted wrench is used for removal and replacement of pulleys, while 33 spline cylinder on shaft is inserted into pulley locking bolt. 4Premium Material: This wrench kit is made of sturdy steel material, provides a powerful mounting force while ensure wear resistance, impact proof, and anti deformation. 5Operation: Place the drill bit in the center hole of the hexagonal key and then place both in the center of the alternator clutch, fix the drill bit, rotate the spline nut to lock or unlock.