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 3×20 mm screws with threadlock (4).