Corrosion resistant die cast aluminium alloy. Weatherproof and durable silicone rubber gasket. Stainless steel screws. Thermal shock resistant safety glass. Ultraviolet stabilized polyester powder coat finish in black, light gray and antracite gray. Double layer polyester powder paint resistant to corrosion and salt spray fog. Fixing to ground: Avolux' recommend to concrete the root of the pole to improve stability.