Data hmasa ber
Ladder san zawng a ni 2.5 m     (2500 mm)
Plan-a staircase sei zawng chu 3000 mm
Step awm zat 13
Step thickness a ni 50 mm
ledge step hrang hrang a awm 50 mm

stair string a ni
Bowstring sei zawng a ni 4167 mm
Ladder angle a awm 39.8°

Step size hrang hrang
Step San zawng a ni 192 mm
Step thuk tak a ni 281 mm
Riser san zawng a ni 142 mm