Stair Footboard： Stair Footboard: The footboard has four types according to having front-armour plate and girder connection or not, which are T1，T2，T3，T4.Considering from the economy, suggests to use 100mm multiple modulus width (for example 500, 600, 700, 800, 900, 1,000, 1200mm and so on).(series 1 uses 125,155, 185, 215, 245, 275, series 2 uses 125, 165, 205, 245, 275mm and so on).Footboard tolerance: width: W±3mm，length: L-3mm
