Heavy Duty -- The antenna mast clamp is made of 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 to 3.7 in (25-94mm) Versatile mounting -- Mast to Mast Clamp is ideal for mounting a larger antenna to a mast or mounting one pole to another.It supports most WiFi,PCS,Cellular,TV antennas,flagpoles,umbrellas fishing rods and other outdoor decor. Package Includes -- 2 Sets antenna mast clamps ( 6*jaw brackets, 2*U bolts, 4*nuts, 4*washers).If you are not satisfied with any product, please don’t hesitate to contact us,we will serve you our best. 1