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摘要

The drill bit (16) comprises an injection-moulded hard metal component with at least one integral cutting edge and an integral central boring in its base for engaging with the male fastener (29), so that the support surface (16) on the bottom side of the drill bit is clamped against the front end (30) of the holder. An insert (21) comprising a material which is softer than injection-moulded hard metal is secured inside the central boring and provided with a thread for securing it to the fastener.