Due to the angle of 15° at the opening part, it can work in the range of 30° if using both sides of front and back, and demonstrates its power in a narrow place.
Standardizing the distance between the centers of diameter and the drive angle, it makes troublesome conversion easier when using a torque wrench. (distance : NBNS3-08 to 13 : 20mm, NBNS3-14 to 19 : 25mm)