Although it is a professional of electrical and electronic circuits, it is used for connection of a recent small terminal block (CC-Link or euro type terminal block). Up to now, I used a flathead screwdriver with a width of 2.5 mm in general, but there were many things to screw up because the width is not exactly tightened strongly, but if this driver is perfect size Screw damage is greatly reduced. Moreover, the shape and size of the grip part is exquisite and it seems that fatigue is alleviated. We are thinking about purchasing other size objects.