JW Winco's Hand knob with plastic tip, maximum heat resistance of nylon plastic: 110 degree C, matte black finish, Made of glass filled nylon plastic, stainless steel, molded-in threaded stud. An excellent choice for corrosion-free applications. The plastic tip on the stud prevents indentations or other damage from occurring. European standard 1.4567 (American standard 316 series). 25mm knob head diameter, M5 x 0.8 thread size, RoHS compliant.