| ◆ | Made of special carbon tool steel | | | | |
| ◆ | Produced with overall thermal treatment, featuring high durability | | | | |
| ◆ | File teeth in a uniform shape and with a uniform depth, ensuring a high filing efficiency | | | | |
| ◆ | Not suitable for filing of soft metal materials (such as aluminum, copper and molding plate) and non-metal materials (such as plastic, nylon, fibers, etc.) | | | | |
