A wheel PCD is made up of the number of studs that hold your wheel on, and the diamater in mm of an imaginary circle that goes through them all
So 4 x 100 would be 4 studs with a circle diameter of 100mm.
If you're not sure of the PCD of your car, just ask us and we'll be happy to help
I bought the OR-18 kit for a mazda mx5.
kit is great, fees sturdy and looks to be of good quality. I feel confident using this boss kit, unlike my previous eBay endeavour. Buy this kit it has to be the best value for money decent kit available! Avoid the eBay ones!