What Grivel say:

The new 360° screw can benefit all ice climbers. In situations where safety depends on speedy screw placement (crevasse rescue or steep ice) the 360’s sharp bite and easy starting are quite reassuring. When obstructions of rock or ice prevent a normal fixed hanger’s rotation, the 360’s handle may be lifted away from the surface and turned freely. The 360’s super-slick finish makes it very difficult for ice to clog its core. The 360’s efficiency makes it possible to place an ice screw where and when you want to, not just where and when you are able to.