Patent ID: 8794881

Claim:
A drilling tool having a large core drill ( 24 ); a center drill ( 14 ) mounted in an axially flexible manner within the large drill; at least one limit stop limiting axial movement of said center drill relative to the large drill; at least one pin ( 24 ) that is supported on the large drill, the shaft thereof extending towards the center drill ( 14 ); characterized in that the pin ( 24 ) is formed at an attachment body ( 26 ) comprising a contact surface ( 46 ) that abuts on a counter contact surface ( 52 ) of the drilling tool ( 10 ), the contact surface ( 46 ) of the pin ( 24 ) of the drilling tool ( 10 ) is configured as a conical surface that extends in self-locking manner with a cone angle toward the pin, the angle being smaller than 15 degrees and larger than 5 degrees.