Available in metric and inch sizes, RoHS-compliant, Series GN 5337.3 is suited for applications where any unintended loosening of knob may lead to accidents. Constructed of glass fiber-reinforced technopolymer plastic with black matte finish, hand knobs are temperature resistant to 355°F, and also are resistant to solvents, oils, grease, and chemical agents. Lobe knob is not engaged with tapped insert and can be turned during non-operative mode.