... , various widths, used to create the vertical "rise" in the step.TREAD -- 1" to 1-1/16" thick, 8" to 12 ... " wide, the actual step surface.NOSE (Nosing) -- also called stair nose, bull nose, stairwell ... used). These are used to create finished edges on the top step, around stairwell, sunken living room, etc. Finished moldings should match ...