654M# aluminum alloy STEP mitsubishi 600, 800, 1000 escalator steps654M# aluminum alloy STEP mitsubishi 600, 800, 1000 1,this is Schindler escalator step ... . 2,the technical parameters: 654M# aluminum alloy STEP mitsubishi 600, 800, 1000 3,material: aluminum alloy 4,we can produce many ...