Wheel Centering Sleeves by SPC Performance These SPC Performance wheel centering sleeves are designed to thread on the wheel studs of your heavy-duty truck. They are also designed to decrease tire vibration, reduce tire cupping, cut re-balancing costs, improve fuel mileage, and improve tire life. The sleeves are manufactured from durable steel and then zinc plated to resist corrosion. Make your ride smoother, quieter, safer, and more efficient with these SPC Performance wheel centering sleeves. Please Note: Smaller outside diameter. Features Wheel Centering Sleeve Type: External Wheel Centering Sleeve Axle Position: Steer Wheel Centering Sleeve Thread Size: 22mm x 1.5 Wheel Centering Sleeve Underhead Length: 1.310 in. Wheel Centering Sleeve Material: Steel Wheel Centering Sleeve Finish: Zinc plated Benefits Manufactured from durable steel and then zinc plated to resist corrosion. Make your ride smoother, quieter, safer, and more efficient Applications Universal What's In The Box? 6 - Wheel Centering Sleeves Warranty Limited Lifetime Warranty