Our versatile suction anchors adhere to most smooth, flat, non-porous surfaces. Whether anchoring MoonShade to glass, metal vehicle roofs or side panels, and even fiberglass, you’re good to go! Even if suction anchors aren’t your primary MoonAnchors, we think they’ll come in handy when setting up MoonShade in some unexpected places. Suction anchors allow for creative MoonShade set ups by providing a broader array of sphere anchor points. *Not for use in windy conditions. Watch the Video Product Specs Base diameter 4.5in; add 0.5in for tab Height 1.75in