Type C - with plain blind bore, Tol. H7
Type D - with threaded through bore
Type E - with threaded blind bore
DIN6335 Star Knob, Aluminium, Through & Blind Bore.
These star knobs are forged, resulting in a close grain structure which produces a high tensile strength and a smooth surface. They provide a firm grip to easily achieve high torques whilst being comfortable to use.
Any casting flash is invisible due to the advanced production techniques.
Matt surface (ground) MT, flash mark not visible.