| 摘要 |
A one-piece drilling head ( 4 ), which is securable, in a material-locking manner, on an axial end of a helical shaft of a drill, is formed of a hard material and has four radially extending, in a cross-shaped manner, legs ( 5 ) forming respective cutting edges ( 6 ), and a tangential reinforcement ( 7 ) provided at a radially outer rim of each leg ( 5 ) in an axial region of a cutting edge ( 6 ).
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