It includes the long hole for extending through sighting device that a kind of sighting device board, which drills into bone, and long hole, which is configured to receive, corresponds to position slot along longitudinal direction in each column in wherein guide sleeve different position and angle therein. The sighting device can use positioning device relative to bone plate, comprising: a pedestal, the pilot hole extended with one, thus from the first side of the pedestal to the base portion of second side. The guide hole is formed as long hole and is configured to receive wherein relative to guide sleeve angle positioning device.
