Trend Craft Pro 1/2in shank Intumescent strip cutter - 20mm width Two Flute Carbide tips. Cuts the perfect sized slot into door edges and door frames for fast, perfectly flush fitting of intumescent strip. Bearing guide ensures the correct 4mm depth and 15mm width is always achieved to meet Fire Regulations. 1/2in shank, for heavy duty work with bigger routers. Position of groove can be altered with the router plunge for correct setting for 45 minutes fire and smoke protection. PTFE coating to minimise heat and resin build up for increased cutter performance and longevity. 1/2in shank for use in bigger routers and heavier applications with 'K'mark shank to ensure safe working practices. Specifications • Shank Diameter: 1/2 • Dia Metric: 40 • Cut Length Metric: 15 • Overall Length Metric: 67 • Bearing Dia Metric: 32 • Rebate Metric: 4 • Type or Grade: 15mm strip