Bellawood Prefinished Solid Wood Classic Gunstock Oak 5/8 in. T x 11.5 in. W x 48 in. L Retrofit Stair Tread, $79.99 USD/Box, LL Flooring (Lumber Liquidators)

This 5/8" x 11-1/2" x 48" prefinished Gunstock Oak retro fit tread is made to be installed atop existing steps. It provides a sophisticated finish and exceptional durability, ideal for enhancing the look of your staircase.