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CNC Router Bits Spiral Straight Bit With Reversible 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): helical design is good for cutting. 4): Produced by CNC milling machines make sure higher precision. 5): Competitive price and short delivery time. Descrition: CNC Router bits with changeable knives. Tool body made of heavy metal, cutting edge parallel to cutter