Hub diameter is 4.25 inches. Compatible with 10.8 cm diameter. Mainly for 6-hole wheels. Installation involves removing the wheel, inserting the cap from the back of the wheel, and pressing it onto the hub surface to secure it. Ideal for Daytona wheels on Hiace, Caravan, etc. *Not compatible with genuine steel wheels. Hiace: Hub diameter is 106mm, so it's a perfect fit. Caravan: Hub diameter is 100mm, but it's a perfect size for Daytona wheels at 108mm, so it should fit without play. *For Caravans, if there is play after installation due to individual vehicle differences, a separate 108mm hub ring is required. Material: Stainless steel Made of stainless steel, so it's rust-resistant! It will shine even more if you buff it ⭐︎ *Instant purchase is welcome ☆ *No smokers, no pets ♪