Most newer cars have specific areas in the chassis designed for safely lifting the vehicle. These jack points require a pinned adapter that professional technicians use with their hydraulic car lifts. This jack pad locks into the car by simply turning the unit and is specifically designed to be used with most floor style hydraulic jacks. It's low profile design gives your jack sufficient clearance to slide under the car and then safely lifts it to minimize potential slippage. If you are using these pads with a car lift, you will need (4) units to properly lift the vehicle. Fully CNC machined from Delrin.