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TCT Router Bit Steel Shank Solid Carbide Spiral Bit For Woodworking Description: T.C.T router bits for woodworking. Made of 45#carbon steel, the cutting parts are Micro-grain Tungsten carbide. The welding type is silver welding . With two times grinding rough grinding and finish grinding make sure tips sharp and high precision. solid carbide cutting parts, #45 carbon steel shank. spiral cutting edge. Bits package: color plastic box, transparent plastic box. pouch bag and so