This Wilwood adapter rotor/hat register ring measures 2.80 inches in diameter and is sold as a two-pack to match rotor and hat seating interfaces. The rings provide a consistent registration diameter where a 2.80-inch seat is required, helping align and center rotors on hats for proper installation in compatible brake systems. They act as targeted register spacers to address mismatched diameters.

Wilwood Adapter Rotor/Hat Register Ring 2.80in Dia. - 2 Pack