Other Uses
Long ice-screws are now often used to create V-threads (a type of thread-hole /ice-bollard); many illustrative examples can be found on www.youtube.com. By making two ice-holes that intersect, an inexpensive but strong cord (typically static climbing accessory cord or tape, made of perlon, Dyneema or Specta) than be threaded through, making a relatively safe and cheap anchor. This can be an attractive option at belays and when ice screws are in short supply. V-threads can be particular useful as rappel/abseil points where it is often necessary to leave final anchor behind. A piece of wire - typically a piece of old coat hanger shaped for the purpose - or a stiff flexible purpose built tool with a small hook at one end and a hanging loop at the other end, is often used to aid threading of the cord, although it is not strictly necessary.
Read more about this topic: Ice Screw