Heavy Duty -- The antenna pole mount is made of 2.5mm thick high quality galvanized zinc-plated iron with anti-rust coating finish,it can withstand harsh weather conditions,ensuring long-lasting performance. Strong Clamping Force -- The V-jaw brackets keep assembly nice and secure even in inclement weather.It can provide a stronger grip on the poles,ensuring they don't slip down in the wind. The whole set of accessories can be used for holding poles with diameters ranging from 1.1 to 1.97in (30-50mm) Easy to install -- The antenna mast bracket comes with all necessary hardware and accessories,making installation quick and easy.Widely used for outside home antenna pole holder. Package Includes -- Main mounting bracket*1 ,Clamp V Jaw Bracket*2 ,U-Bolt*2 ,Nuts*4 ,Spring washers*4 ,Plain washers*4 ,Screws*4. If you are not satisfied with any product, please don’t hesitate to contact us,we will serve you our best.