The antenna mast installation metal is galvanized steel, featuring an anti-rust coating to prevent rust and corrosion during outdoor installation. It's built to be heavy-duty. The pole installation bracket, made from 0.2-inch thick galvanized steel, is strong enough to support heavy antennas. This antenna pole is easy to install, utilizing a V-JAW block with double U-shaped bolts to prevent the pole from sliding down. The pole installation seat can be used for fixed poles, with a diameter range of 1.1 to 1.97 inches (30-50mm). Widely used for external antenna stands, it can be used for building roofs or walls and is suitable for antennas. Color: Silver Material: steel Package Contents: 1 x Antenna Mast Brackets 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 to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.