Supplying and installing solid treads to a steel staircase involves fitting durable wood or timber treads onto the metal framework of the stairs. The process includes measuring and cutting the treads to the precise dimensions of the steel stringers, ensuring a secure and stable fit. The treads are then either screwed, glued, or bolted to the steel supports. This installation enhances both the appearance and functionality of the staircase, offering a high-quality, slip-resistant surface that complements the industrial look of the steel structure.