Nosing is the part of a stair tread that extends slightly over the edge, providing a rounded or sloped edge for safety and comfort. It is designed to enhance the grip and visibility of each step, helping to prevent slips and falls when ascending or descending stairs. Nosing can be made from various materials, including wood, metal, or composite materials, and is often finished to match the overall design of the staircase. This feature also helps to protect the edges of the treads from wear and damage, extending the lifespan of the staircase while adding to its visual appeal.

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