Corvette jacking pucks prevent body damage when lifting the car on a two post lift. Most tire shops and a lot of service shops use a two post lift and I have seen GM dealer shops destroy the side panels with a two post lift! Never trust a shop that has a two post lift without using these type jacking pucks! Keep a set in your trunk to use in case your Vette needs to be lifted for any reason. They work with floor jacks that have a flush pad. These wont work if you use a cupped floor jack pad! A small piece of wood in the jack cup will fix that issue. These adjust for tightness on your car, almost every car is a little different on the fit. Also I have the orange tape on these to help prevent you from driving off with these in the car and loosing them down the road! Been there done that!!!