Multifunction firmer chisel with interchangeable blades, to use as a traditional firmer chisel. 3 widths of cut: 25, 30 and 40mm with only one tool. Saving of place and weight in the toolbox: one tool instead of 3 chisels. And furthermore a tool always perfectly sharpened. The change of knife is done in few seconds. The removable knives can be resharpened. In option, it can be used as a scraper with its adapter for TERSA knives. And for only 5 grams more, it replaces the jigsaw.