Hinkley's Pier Mount Base is made of durable aluminum and is available in 13 of our robust finishes to match your fixture. Convert one of the over 60 Hinkley post mount outdoor light fixtures into a pier mount light. The mount includes a cast aluminum flange base that fits a standard 3 in. dia. post cup that attaches to the pier or upright (mounting bolts not included), and an aluminum bolt cover in the matching finish that fits overtopthe base.