A stair step consists of the tread and the riser. The tread is the horizontal surface of the step that you step on with your foot.
Telescopic handrails made of metal are particularly suitable for scissor staircases. They are not fixed at specific points, but move with the staircase as it is pulled out and pushed in. Once the staircase is in position, a telescopic handrail ensures a safe and stable ascent.