These FEBI BILSTEIN Cylinder Head Bolts are designed for a wide range of VW, AUDI, and SKODA models. They have a length of 150mm with an external thread size of M9 x 1.25 and a thread length of 88mm. The spanner size is 12, and the bolt head design is a female star. The screw length below the head is 140mm, and there are 8 bolts/screws included. The weight of each bolt is 0.05kg. They are compatible with numerous VW models including Golf IV, Golf V, Polo, Touran, Golf VI, Caddy III, and more. AUDI compatibility includes A2 and A3 models. SKODA compatibility includes Octavia II, Fabia II, Roomster, and others. SEAT compatibility includes Ibiza, Leon, Altea, Arosa, Toledo II, and Inca models. The part numbers associated with these bolts are 036103384B, 30103384B, 36103384B, and 030103384B.