According to the Ministry of Public Security "tool on the part of the Provisional Regulations on the implementation of control" means control tool knives, Trigonobalanus scraper with self-locking device similar to the flick-knife, as well as other single-blade, double-edged, Trigonobalanus knives, small tip angle at 60 degrees, blade length of more than 15 centimeters or greater than 60-degree tip angle, blade length of more than 22 centimeters wide range of cutting tools are prohibited from any sales. Of private production and sale of control of the tool units and individuals, the public security organs in accordance with the severity of the circumstances dealt with in accordance with the law.

　　Control tool is the dagger, Trigonobalanus scraper with self-locking device similar to the flick-knife, as well as other single-blade, double-edged, Trigonobalanus sharp tip angle of less than 60 degrees, more than 15 centimeters in length blade tip or point of great at 60 degrees, more than 22 centimeters in length blade of the various types of knives. (Source: Changshu century)