GN 5335 Star Knobs Stainless Steel AISI 303, Matte Shot-Blasted Finish, with Tapped Blind Bore. GN 5335 star knobs are manufactured from solid stainless steel bar stock. These decorative star knobs were primarily manufactured for the food processing machinery industry and yet, there are numerous other fastening or clamping applications in non-corrosive environments that these knobs can be used for.