Sharp Chucks & Machines Ltd supplies Round Chain Saw File. Sharp Chucks & Machines Ltd is an ISO 9001: 2000 recognised company manufacturing a wide range of Lathe Chuck & Machine Tool Accessories for various industrial applications. The Round Chain Saw File is used for sharpening round hooded chain saw teeth and comes with safe point in a special tooth construction. The Round Chain Saw File provides crisp cutting action and is available in double cut-smooth in the 8" size suitable for sharpening round chain saw teeth.