Bosch OSL138K Starlock Oscillating Multi Tool Hook Knife Blade, 1-1/4" High-carbon steel cutting edge for cutting applications in carpet, cardboard and asphalt shingles Special hooked design for fast clean 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