These RIPSAW blades are made of durable spring steel. They are manufactured with set-teeth for fast, easy sawing of wood and plastic exclusively. They are ideal woodworking tools for limitless wood cutting projects, are compatible with other accessories and they produce a clean finished cut. for your safety and protection, NEVER operate a rotary tool without the Gyros Guard Safety Shield when using cutting accessories Pack Contains: Saw Blade Used with Mandrel No. 80-18100. Pack Contains: Saw Blade, Used with Mandrel No. 80-18100.