654M# aluminum alloy STEP mitsubishi 600, 800, 1000 escalator steps654M# aluminum alloy STEP mitsubishi 600, 800, 10001,this is Schindler escalator step,we are ... .2,the technical parameters: 654M# aluminum alloy STEP mitsubishi 600, 800, 1000 3,material: aluminum alloy4,we can produce many kinds of ...