INSTALLATIONL: Professional Installation Recommended We recommend getting these adapters installed by a trained professional, but it is not necessary. Make Sure You Get 5-7 Turns Before Tightening Must be torqued down to factory specs. No Gap In Between The Adapter And Hub The back of the adapter must sit flush against the vehicles hub. Full Set Of Lug Nuts Included To Mount The Adapters You will then use the extra lug nuts to mount you wheels on to the adapters. Please make sure your torque them down to factory specifications. Vehicles Studs Cannot Pass The Face of The Adapter If the studs do pass the face of the adapter, you will need to grind/cut them shorter. (This only applies to 1.5" adapters & smaller). Please Make Sure You Take The Proper Measurements Before Purchasing If you are not sure, you can always email us and we will point you out to the right direction. We will be more than happy to help and get your order correct the 1st time. No Returns or Exchanges Once They Have Been Installed