Type E - with threaded blind bore.
Type C - with plain blind bore, Tol. H7
GN 6336.1 Star knobs, with Steel Bush.
These star knobs provide a firm grip to easily achieve high torques whilst being comfortable to use. The face of the boss is exactly square to the bore and is in steel to prevent edge breakages. Cross-dowels can be used successfully as these knobs allow a perfect connection.
Plastic, Duroplast (PF), black, shiny
Bush - Steel, zinc plated, blue passivated.
Also available with stainless steel bush, GN6336.1.