1. Fitment: The alternator pulley drill bit kit is replacement for Bosch alternators, replacement for , replacement for , and cars with 33 teeth spline hole.2. Parameter: 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.3. Function: The two part splinted wrench is used for removal and replacement of pulleys, while 33 spline cylinder on shaft is inserted into pulley locking .4. Premium Material: This wrench kit is made of sturdy steel material, provides a powerful mounting force while ensure wear resistance, impact proof, and anti deformation.5. : Place the drill bit in the center hole of the hexagonal key and then place both in the center of the alternator , fix the drill bit, rotate the spline nut to lock or unlock.Specification:Item Type: Alternator Pulley Drill Bit KitMaterial: SteelHex Part Length: Approx. 17mm/0.67in33 Teeth Spline Part Length: Approx. 30mm/1.18inSpline Outer Diameter: Approx. 20mm/0.79inSpline Inner Diameter: Approx. 12mm/0.47inDrill Bit Length: Approx. 75mm/2.95inFitment:Replacement for Bosch AlternatorsReplacement for Replacement for Replacement for -BenzReplacement for FiatReplacement for Seat(Fits for any pulley with 33 teeth spline hole)How to Use:1: Place the drill bit in the center hole of the hexagonal key and then place both in the center of the alternator .2: Fix the drill bit, rotate the spline nut clockwise to unlock the alternator pulley, or reverse direction to lock the new packing list:1 xDrill Bit1 x 33 Teeth Spline