Trend intumescent cutter set for either frame or door applications with standard intumescent strip it neatly cuts grooves on doors or frames to accept intumescent strip which enables the formation of effective barriers to both fire and smoke by using alternative ball bearing diameters other seal thicknesses can be introduced alternative bearings can be purchased to suit other thicknesses for 40 mm thick and 100 mm width intumescent strip diameter 24 mm cutting depth 10 mm bearing 16 mm shank 14i