Material: Aluminum Total height: 3.2M Open size: 322x47.5x8.4cm Folding size: 80.8x47.5x8.4cm Hight between steps: 27.5cm Number of steps: 11steps Tickness of alum: 1.5MM Max load: 150Kg N.W(Kg): 9.3 G.W(Kg): 10.3 1*20' : 517PCS 1*40'HQ: 1223PCS Packing Size: 84.5*53.5*13.5CM