1. step size: the step size is between 26 and 30 cm.
2. Step height: the step height is about 15- 16 cm.
3. Height of railing: The height of railing is about 90cm.
4. Stair length: Stair length is 240-280cm.
5. stair handrail: the height of stair handrail is about 90 cm.