Aluminum piston knobs made from actual pistons for small engines. 1.75 inch diameter, 1.5 inch tall, 1.8oz. 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! Free shipping in USA
