Here is a vintage cast iron industrial swing arm stool that you could mount on a work bench or wall. The wood seat is 10 1/2" round x 1 1/2" thick. The mounting bracket measures 7" long and the mounting holes measure 5 3/4" apart when measured from center to center. The cast iron brackets under the seat are marked 420 and the sliding arm is marked 400. All the cast iron brackets are in very nice condition, no cracks or breaks. Wood seat is good and solid. Works good. Please see all photos for overall condition. Guaranteed old. Thanks