| 摘要 |
A drilling tool including a shank having a chuck end adapted for being held in a chuck of a drill, and an opposite, bifurcated end formed with a bore, the bifurcated end including two portions separated from each other by a gap, an abrasive annulus formed at least partially around the bifurcated end, and a wedge member slidingly disposed in the bore, the wedge member operative to push the two portions away from each other when moved towards the chuck end.
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