Left and right aluminum caster blocks improve the appearance, ruggedness, and control of your Sledge^®. The billet 6061-T6 aluminum construction adds strength and precision where you want it most. The brilliantly-anodized finish adds vibrant color to your vehicle and features a high-contrast laser etched TRX logo. Includes kingpin bushings (4) and 3x20 mm screws with threadlock (2).