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Cnc Router Bits Flush Trim bits Reversible Knives Quick details: 1): Micro-grain carbide tips replaceable. 2): high quality carbon steel body with hear treatment. 3): with ball bearing guides 4): Produced by CNC milling machines make sure higher precision. 5): for use of portable routers or CNC machining centers. Description: CNC Router bits with changeable knives. Tool body made of heavy metal, cutting edge parallel to cutter axis and face cutting. Changeable carbide tips