The billing code is1080419990000000, and the general taxpayer tax rate is 16%. The common material of fire-fighting electricity is metal trunking: 1. The thickness of galvanized trunking with different specifications will be different, and the bigger the trunking, the thicker it will be. 2. Slot connector-used for connection between slots. 3. Slotted screws (anti-slip screws).