Trend C223X1/2TC Intumescent Cutter Set 20mm x 40mm Intumescent Recesser 1/2\" shank FEATURES For either frame or door applications, with standard In tumescent Strip Neatly cuts grooves on doors or frames to accept In tumescent Strip which enables the formation of effective barriers to both fire and smoke By using alternative ball bearings diameters other seal thicknesses can be introduced Alternative bearings can be purchased to suit other thicknesses For 4.0mm thick and 20.0mm width in-tumescent strip SPECIFICATION D: 40 mm C: 20 mm B: 32 mm E: 4 mm Shank Diameter: 1/2 \" Fire Check: 60 minutes