With the Fein 63502174230 bi-metal segment saw blades, you make clean flush cuts directly against adjoining surfaces and into tight corners. The durable hss teeth deliver high wear resistance and a long service life when cutting thin sheet metal up to approx. 1 mm, wood, plastics, brass, bronze, and GFRP. Its circular 85 mm diameter design allows you to neatly trim door frames, baseboards, or pipes without overcutting edges or damaging surrounding materials. The secure Starlock mount fits Starlock, StarlockPlus, and StarlockMax multi-tools, providing direct power transfer and minimal vibration. This pack includes 5 circular saw blades.