A2 Stainless Steel. These nuts & washers need between 10-14mm of thread sticking out from the manifold face once tightened. Above 14mm will risk the thread bottoming out inside the nut and not tightening down on the manifold.
M8 Exhaust Dome Nuts A2 Stainless Steel Kawasaki Yamaha Susuki Honda
3x Genuine Vauxhall Astra Corsa Meriva Zafira M8 Exhaust Manifold Nuts 90502418
10x Genuine Vauxhall Astra Corsa Meriva Zafira M8 Exhaust Manifold Nuts 90502418
10x M8 Exhaust Manifold Nuts GENUINE Vauxhall Astra J 2010 to 2016 NEW 90502418
10x M8 Exhaust Manifold Nuts GENUINE Vauxhall Combo C 2001 to 2011 NEW 90502418
10x M8 Exhaust Manifold Nuts NEW GENUINE VAUXHALL Astra Adam Combo 90502418
