JW Winco Nylon Plastic Hollow Knob, Knurled, Steel Threaded Stud, M4 x 0.7 Thread Size x 20mm Thread Length, 19mm Head Diameter (Pack of 1)

JW Winco's Hollow knurled knobs with zinc plated steel threaded stud. On clamping operations, the partially protruding steel hub prevents chipping of the plastic. Maximum heat resistance of nylon plastic: 110 degree C (230 degree F). Knob body: Black nylon plastic, smooth, glossy finish; Threaded stud: Zinc plated 12L14 steel, molded-in. RoHS Compliant.