Bullet shaped knob machined from black plastic. Includes 2 set screws for solid mounting, won't pop off like the factory rubber knobs! All knobs have a 1/4" hole but include a bushing to adapt them for chairs with a 3/16" shaft. We even toss in a hex key for the set screws! 1 inch diameter, 1 7/8 inch tall, 0.9oz. Free shipping in USA
