Description: Sharp blade cutting smooth no burr, no edge High abrasion resistance, high-precision grinding technology, superior abrasion resistance Using high-frequency welding technology, strong, durable, and long service life Purposes for wood, acrylic material edge processing, metal materials can't operation. Applicable for electric trimmer, engraving and milling machine, CNC engraving machine, CNC machining centers and other machine tools Specification: Material: alloy blade, carbon steel handle Body: solid hardened steel Blade: micro grain carbide Bearing: totally enclosed & lubricated Size: about 1/4'' x 1/2'' x 22mm (Shank x Radius x Cutter Length) Total Length: Approx. 56mm/ 2.2inch Package Includes: 1 Piece Radius Round Over Router Bit