Autodesk 3ds Max 2014 / 2017 / V-Ray 3.4.01 / OBJ / fbx

A stairway, staircase, stairwell, flight of stairs, or simply stairs, is a construction designed to bridge a large vertical distance by dividing it into smaller vertical distances, called steps. Stairs may be straight, round, or may consist of two or more straight pieces connected at angles.