Description: Sharp blade cutting smooth no burr, no edges High abrasion resistance, high-precision grinding technology, superior abrasion resistance Unique head design, chip removal more smoothly The Stacked Rail and Stile Router Bit will cut both rail and stile in a cove design. 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 Type: rounded corners Size: about 1/4'' x 1/4'' (Shank x Radius) D (Diameter): about 15.35mm R(Radius): about 3.17mm B(Width): about 3.17mm H(Thickness): about 7mm L(Total Length): about 52mm Package Includes: 1 Piece Radius Round Over Router Bit