To adjust the timing during replacing the belt or camshaft. APPLICATION:•VW: Lupo, Fox, Polo, Golf, Golf Plus, Bora, Jetta, Beetle, Scirocco, Passat, Sharan, Touran, Tiguan, Caddy, Transporter (98-11) •Audi: A2, A3, A4, A5, A6, TT, Q5 (98-11) •Skoda: Fabia (II), Roomster, Octavia (II), Superb (II) (00-11) •Seat: Arosa, Ibiza, Cordoba, Altea/XL, Leon, Toledo, Alhambra (99-11).