product feature ：

1. The ladder beam weighs only 12kg per meter, and the step foldings weigh only a few kilograms each
2. Precision-manufactured with equipment, accurate dimensions, bolted connections, extremely simple assembly
3. The steps use fiber cement boards with reinforcing mesh, ten times stronger in bending strength than C40 concrete
4. Due to its lightweight and simplicity of installation, it serves as the vertical passage during construction.