Staircase width 41-inch and less: 2 risers recommended. Staircase width 42-inch to 57-inch: 3 risers recommended. Staircase width 57-inch to 74-inch: 4 risers recommended. The easiest way to build a solid and lasting staircase. Light and easy to manipulate, this stair frame is quickly installed. Designed in one piece, it is ready for steps. No more complicated assemblies! it will highlight your staircase and add a finishing touch to your house.