Version:
Spiral fluted counterbore with fixed pilot.
DIN 1866-A / ISO 4205.
Application:
For through hole quality fine (ISO values) to DIN 69.
For countersunk screws to ISO 2009, 2010, 7046, 7047 (DIN 963, 964, 965, 966).
Note:
Size 4.6 × 2.4 is not defined in DIN.