Ice Screws
Ice Screws are used for protection during ice climbing as well as anchor points in setting up crevasse rescues. The strongest and most reliable type of ice screws are the modern tubular ice screws which range in lengths from 10 to 23 cm. The approximate strength rating on a modern tubular ice screw is around 10 kN, although it has been found that ice screws in "good" real-world ice hold about 7-8kN, no matter what the fall factor or configuration is.
Full Article