Bosch OSL400K Starlock Oscillating Multi Tool Bi-Metal Serrated Knife Segmented Blade, 4" Bi-metal serrated edge for cutting carpet, cardboard, insulation and other materials Segmented cutting edge, perfect for straight or flush cuts Color coded interface and laser etched blade to quickly identify the right blade Starlock interface for professional performance, also works with OIS compatible tools including Bosch, Fein, Milwaukee, Makita, Rigid, others Precision Swiss made blade