ANTIQUE VINTAGE STAIR NEWEL POST HALF ROUND WALL MOUNT BANISTER 2 AVAILABLE
The half round part is about 18 1/2" tall. The whole piece is 3 3/8" wide. The back board is 7/8" deep. The half round part is about 1 1/2" deep. You are looking at a stairway piece that is half round and looks like it mounts against the wall.