Treads that are narrower at one end than the other. Used to turn corners or go around curves.

Triangular stair treads sometimes used when a staircase turns a comer.

Steps that wind around a corner or post, turning 90 degrees from the original direction and typically having several triangular shaped treads at the turn.

Lines are stored on winders. Ensure that when lines are wound on that you wind them off the same side of the winder. This will stop any twists forming in the lines. A figure 8 or pro-winder works best.