Designer look at an affordable price, Polypropylene seat and back available in six colors, Silver finish powder-coated frame, stacks 15 high. Model 305 is armless and has built-in ganging brackets, Model 306 has arms - Ganging brackets are optional on 306 for an upcharge. Call a PJ & Company Sales Associate for details. Optional set of 4 casters available. Adds 2" to height of chair and screw into specially designed foot. Overall Size: 31" h x 22. 1/4" w x 22 1/2" d Seat Size: 18" w x 13" h Back Size: 20 1/4" w x 13" h Seat Height: 17 3/4" Minimum order of 4 chairs.