The umbrella base is your perfect partner helping you to have more enjoyable outdoor time. Made of a heavy-duty steel frame with powder coating, the umbrella base is not easy to rust, chipping, and peeling for years to come. With 2 hand tightening knobs, the umbrella stand offers a secure grip for tightening the position of the umbrella pole in windy conditions. The umbrella base is compatible with an umbrella pole from 1.37" to 1.88", and it perfectly works with the 1.37"/1.49"/1.88" diameter