| 摘要 |
A hard material insert ( 1 ) for a drill ( 2, 2 ') includes an axially central reinforcement ( 3 ) provided in the insert, and two diametrically opposite, radial arms ( 4 ) each having a cross-section tapering radially outwardly, opposite free side ( 8 ) and connection side ( 7 ), with the free and connection sides ( 8, 7 ) of one of the radial arms ( 4 ) being arranged alternatively to the free and connection sides of another of the radial arms ( 4 ), and a concave recess ( 6 ) provided on the connection side ( 7 ).
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