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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 Metal locking flanged nut. This setup can be used for exhaust manifold studs or for other application that require M8x1.25 studs. We also have non locking nut (flanged serrated M8 Nut) if you require that nut instead of locking nut please send us message when purchasing and we will replace the nut for you. Any questions please contact us.