Note: Only clamps are included; poles are not included. [Easy to Install] Mount 2 antenna mast poles in parallel securely. V-jaw blocks stop them from sliding down, fitting both square and round poles. [High Quality Construction] Crafted from Q235 low-carbon alloy steel that effectively resists rust, and galvanized for oxidation and corrosion protection. [Widely Used] A long-term antenna pole mount suitable for network antennas, TV antennas, weather stations, security cameras, solar panels, LED street lights, and more. [Heavy Duty Hardware] Thick steel blocks support heavier masts without warping, strongly withstanding winds and extreme weather to keep your device secure. The whole hardware fits poles 1" 2.5" in diameter. [Package Included] The package includes 4 steel blocks, 2 bolts, 6 nuts, 6 washers, and 6 grommets