ARP Main Stud Kits (400-8031)M8 X 1. 25 X 32mm Accessory Stud Kit by ARP ARP stainless steel accessory studs can be used for exhaust systems, intake manifolds, and a number of other uses. They are made of ARP's stainless 300 and are impervious to the rust and corrosion that plague ordinary fasteners. The studs feature a unique nut starter nose and a hex broached tip, allowing them to be easily installed using an Allen wrench. Stainless steel 12 point nuts and washers are