Economy SideSliders Set with 2 SpacersSideSlider Slip Plate Rollers For Bind Free Setups When you lift your car to put on scales the front wheels camber in at the bottom. As you let it down the wheels must be allowed to freely camber back out or there will be a small residual bind in the chassis. This will make your wheel weights (and your setups) less than perfect. To avoid this the front wheels must be able to easily move sideways. With SideSlideryour front wheels can move sideways