Use to hold/secure both camshafts at TDC posidtion when replacing timing belt.ONLY applicable to V6 5-valve engines installed in VW & Audi platforms from 1997-2005This pin is used to lock the crankshaft at the position while replacing the timing belt or removing the crankshaft bolt. Applicable (Holder): Audi A4, A6 2.4 (97+)Audi A4, A6 2.8 (97+)Audi S4 2.7 turbo (97+)Audi A4, A6, A8 2.8 30v (95+)VW Passat 2.8 30v (96+)   Applicable (Pin): All Audi/VW V6 engines except 3.0L 5V.VW - AHA, ATQ, BCY, BDPAudi - AAH, AFC, AHA, AKB, ART, ATQ, AUX, AWN, AYS, BBD, BCY, BEL, BFM, BHF, BNK, BSB Size: M18 x 1.5