The metal installed by the antenna pole is galvanized steel, which has anti -rust coating to prevent rust and for outdoor installation. This is very heavy. The rod installation bracket made of 0.2 -inch thick galvanized steel is strong enough to carry heavy antennas. This antenna rod is easy to install, and uses a V JAW block with dual U -shaped bolts to that the pole does not slide down. The rod installation seat can be used for fixed rods, with a diameter range of 1.1 to 1.97 inches (30-50mm). It is widely used for external antennas racks, can be used for building roofs or walls, and is suitable for antennas. Color: Silver Material: steel Package Contents: 6 x Antenna Pole Mount Kits Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.