Double Antenna Mast Clamp V Jaw Block with V Bolts, Heavy Duty Anti-Rust Mast to Mast Mount Bracket Kit Features: High quality, Special design, heavy and not easy to break. Easy installation,Fits many sizes, Fits most masts Waterproof and rustproof, suitable for outdoor antenna for a long time. Material: Iron Surface treatment:Dacromet plated R Installation size range 25-54mm Suitable for a range of pipe diameters:ranging from 2.5cm to 5.4cm Application : for TV Antenna, CB Ham Antenna Pipe Mount Bracket, Outdoor 4G LTE Antenna, tv cross-over ,wifi antenna, yagi antenna, loraantenna, patio parasols, flag post, torches, fishing rods, pipe etc.