Have a look at Circuit Specialists' lineup of affordable quarter inch knobs for your electronics projects. Designed to work with virtually any potentiometer, these rugged knobs have diameters of 9/16, 3/4, 1 1/16, and 1 5/16 inches and they are available in straight and diamond knurl, heptagon with skirt, set screw, fluted, and brass bushing configurations. Save even more when you buy in bulk.