Sharp cutting smooth no burr, no edge High abrasion resistance, high-precision grinding technology, abrasion resistance Unique , 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 , carbon steel handle Body: solid hardened steel : micro grain carbide Bearing: totally enclosed & lubricated Type: rounded corners Size: about 1/4' x 1/8' (Shank x Radius) Total Length: Approx. 2-1/8" Package Includes:(20 Pack) 1 Piece Radius Round Over Router Bit