9897 is a rotary file set manufactured by Bahco, a Swedish power tool and hand tool manufacturer. It consists of 11 round files in a variety of shapes and sizes for filing and deburring in a variety of materials. The set includes files in the following shapes: square, round, oval, half-round, cylinder, and three-square. Each file has its own guard to prevent over-filing, and is made from a high-grade steel that is heat hardened for durability. The set also includes a plastic pouch for convenient storage and portability.