'Race Studs 101'
If you are unsure of what you need please consult an expert familiar with your application and the components you have on your car. The following are some of the dimensions and parameters that you need to understand about your specific application before you purchase wheel fasteners from ACS.
some car clubs now require that you use steel nuts and steel studs if you are going to track your car.
The "1.5" eg: Porsche/Audi/VW OE wheel use a spherical seat wheel, while common aftermarket wheels such as BBS often require a conical seat bolt or nut. Please make sure you are aware of your wheel's requirements beore placing an order.