Simpson Strong-Tie TA 8-1/4 in. 12-Gauge ZMAX Galvanized,unfinished-red-oak-evermark-,L.J. Smith Stair Systems 36-in x 1.75-in Unfinished Poplar,EVERMARK Stair Parts 39 in. x 1-3/4 in. 5105 Primed Square,EVERMARK Stair Parts 39 in. x 1-3/4 in. 5105 Primed Square,