ABS material: polymer composite material, ABS, non-metallic material. Installation method: Install the flood protection board from left to right, insert the connecting mechanism first, then snap it into the locking mechanism. If you need to adjust the angle, you can use the locking mechanism to fine-tune the placement angle by 3°. Easy to store: The product is stackable to save space and has a variety of locking structures for safety and security. L-shaped bookend principle: the weight of the water is concentrated at the bottom of the water retaining board, converting gravity into pressure. Even if the flood rushes to the top of the water retaining board, the water retaining board can still be very stable and will not overturn. The higher the water level, the more reliable the water retaining effect! Wide range of applications: suitable for municipal, garage entrance airports, garages, etc.