J.W. Winco, Inc., now offers GN 421.10 Technopolymer Plastic Hollow Knurled Knobs with Stainless Steel Non-Marring Tipped Threaded Studs, with Brass or Plastic Tip, in metric sizes. These RoHS-compliant hollow knurled knobs with brass or plastic tips at the end of their threaded studs are used in applications where marks and damage on the workpiece are unacceptable. In clamping applications, the partially protruding steel hub of the knob prevents chipping of the plastic. The knob body is black technopolymer plastic, with a smooth, glossy finish. The threaded stud is stainless steel,, molded-in, while the tip is brass or plastic.