The vertical face of a step.
These are used to cover the face of the step, either all the way across the step or just the side.
Height of the step, which varies per house (vertical surface).
The vertical space between the treads on a stair system. There are three (3) types of risers: closed, open, and partial. Closed riser - A finished wood member closes off the space between two stair treads. Open riser - There is nothing in the space between two stair treads. Partial riser - A wood member is typically fastened to the underside of each tread, closing off a portion of the space between treads.
A series of locks having no intermediate pounds, so that the top gates of one forms the bottom gates of the next. Also called staircase locks.