The garden umbrellas offered by Carolina Patio Warehouse feature a heavy-duty anodized aluminum pole, an easy to use crank for raising and lowering the umbrella, a tilt mechanism, and a top-of-the-line Sunbrella cover that resists stains, mildew, and fading caused by the sun. The 8.5' model has twelve ribs, while the 7.5' model has eight ribs.