Counteract’s 20mm centering sleeves are designed to fill the space between a 20mm stud and 22mm stud hole on the wheel maintating a hub centric mount elimianting vibration and premature tire wear. Made from high-temp polymide withstanding heat of 450-degree Fahrenheit. Counteracts WCS-D20 comes in a dealer pack of 1000 allowing for a total of 200-330 wheels installing 3 or 5 per wheel in a triangle or star formation.