I know Grenner Allen wrench set universal 6 angle screwdriver hexagon socket lengthened automatic tool hexagonal hexagonal

Flat head can be boosted. Note: The flat head Allen wrench has a large force area when tightening the deep hole nut, so it can be used with added force, and the torque is large. Ball head is non-energized. Note: The ball head Allen key can be used at multiple angles, and it is easy to enter the Allen nut. Torque is relatively small