Trend CraftPro Two Flute Intumescent Recessing Router Cutter Bit, 1/4 Inch Shank, 24mm Cut Diameter & 10mm Cut Length, Tungsten Carbide Tipped, C209X1/4TCINTUMESCENT STRIP RECESS TOOL: Designed to accommodate intumescent strips in doors and frames, this specialised tool creates recesses. The recesses enable strip expansion during high temperatures, ensuring fire resistance and reducing flame and smoke propagation. TUNGSTEN CARBIDE TIPPED: 2. 0mm micro granular extra hard tips for prolonged sharpness and cutter durability. Ideal for cutting softwood, hardwood, and man made timber boards. PTFE NON STICK