The GKTECH eccentric lockout kit replaces the adjustable toe arm bolts that are prone to slipping under hard driving conditions and ensures that your wheel alignment stays where it was set. The advantage of the GKTech eccentric lockout kit is that our washer kit does offer fixed adjustments so it's not mandatory to run aftermarket/adjustable toe arms. If you are running adjustable toe arms this just means that your eccentric washer is removed (removing the ability to slip) and you will have a little extra adjustment via the washers. Fixed adjustment allows for /- 4.85mm of toe change and -0.51 > -1.81 degrees of camber change Vehicle Compatibility: - Scion FR-S - Subaru ZC6 BRZ - Toyota ZN6 GT86