It twists the previously selected vertices, lines, and faces from ring as the starting point towards the other end.
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| Drag an edge of an arrow or a center of a ring | Drag here after setting the axis like this | Twisted 60 degrees |
You can snap the dragged point to the nearest vertex by 
clicking a right button while you are dragging an edge of an arrow or a center of a ring.
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| When you move an edge of an arrow or a center of a ring by dragging, | You can snap it to the nearest vertex by clicking a right button while moving |
You can twist by 15 degrees by 
dragging with Shift key.