Stairtek Unfinished Red Oak Solid Hardwood 1 in thick x 11.5 in wide x 48 in Length Left Hand Return Tread, $54.99 USD/Box, LL Flooring (Lumber Liquidators)

This 1" x 11.5" x 48" unfinished red oak left return tread adds elegant detail with its mitered return end on the open side of stairs. Its advanced tongue and groove design prevents separation. Made from sustainably sourced hardwood red oak, it can be stained or finished to match existing stair pieces. Suitable for interior use, featuring a 1" bullnose roundover, and proudly made in the USA. Order online or through local stores.