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CNC router bits round corner router bits with changeable knives 20mm shank Quick details: 1): Micro-grain carbide tips to make sure bits sharp and durable. 2): Cutting surface is finished, without burrs and skins char. 3): carbon steel body with heat treatment. 4): Produced by CNC milling machines make sure higher precision. 5): 20mm shank special for CNC milling machines. Description: CNC Router bits with changeable knives. Tool body made of heavy metal, cutting edge