http://www.bdel.com/gear/alpinism/ice_pro.php
You might notice that the TI ice screw is 15 KN as the BDEL is what 10?
http://www.ushba.com/catalog/ice.html#ultimate
The reason I dont prefer to use them on waterfalls is that the metal is not as good as steel screws I use when drilling into the ice. It has more friction.