JW Winco's Threaded blind bore type triangular knob. GN 5339.5 stainless steel triangular knobs were specially designed for use on machinery in the food industry. The smooth and enclosed areas as well as the corner radii comply with the requirements of hygiene standards. With an elegant ergonomical design, these knobs also withstand a relatively high torque. Hand knob: Stainless steel, European Standard 1.4308, matte shot-blasted finish. RoHS Compliant.