You determine the size. Connect with railing brackets with 2x4 and 2x6 lumber to easily add a bench to any size or shape deck. Gain increased seating area while using only 7 in of deck space. Assembled unit stands 36 in H for deck railing, seat is 17 in H. Quickand easy to assemble using basic tools. Includes bench bracket, hardware and instructions. LUMBER NOT INCLUDED.