For installation on windshields 1/2" to 1" thick (or thinner with customer's own spacer). Provides extra-wide mirror for safe visibility. Molded plastic frame, polished convex mirror, and adjustable base that adjusts to any position up-and-down or side-to-side, then secures in desired location. Includes allen wrench.Note: In some states and provinces, ski mirror of a certain size/dimension, and/or and onboard observer may be required. Check local requirements.