WIDELY APPLICATION：Fits most large vehicle mirrors.Maximum size limit It can fit mirrors from 6 inches to 13 inches high, and it can be used on the driver or passenger side. HIGHLY ADJUSTABLE：This clip on towing mirror is fully adjustable. It can be used in the horizontal or vertical position, and the head is articulating to be adjusted for a clear view. ENHANCED SAFETY：Will not block vision of your original mirror .Extendable towing mirrors are ideal for towing large trailers, when rear visibility is impaired. EXTENDABLE：Quick and easy to install- no tools required.This strap-on towing mirror extends the view of your side mirrors by 4.9"or 7",rubber Straps can be adjusted for a secure fit. NOTE：1 * Tow mirror. Please check the size of the towing mirror before buying,avoid misfit.