Description: Fit Most aftermarket Steering wheels / hub adapters with a 70mm 6 hole bolt pattern (Momo, Sparco, NRG) and the 74mm 6 hole bolt pattern (Nardi, Isotta, Tekniq) Outder Diameter: 85mm/3.3'' Inner Diameter : 55mm/2.1'' Thickness: Approx.25mm/1'' Material: Aluminium Alloy