Studs specs Total length 46mm, Side A threads 15mm, Middle section 8mm, Side B threads 23mm This listing is for Grade 8.8 M8x1.25 - 46mm long studs and S.S Serrated flanged nut. This setup can be used for exhaust manifold studs or for other application that require M8x1.25 studs. Any Questions please contact us.