Hub caps Material: Aluminum Alloy Market: USA, Canada, Central Certificate: ISO9001 Part No: 343-4024 Hub caps are Made for many customer, and get good reputation1. Description: Bolt Circle 4-1/2in, No. of bolts, 6; Diameter 5-1/4 in, eight 2-5/8In2. Material: Aluminum, or aluminum alloy.3. Market: USA, Canada, Central America market, Australia, Russia, some asian country.