This is the `Big Daddy? of lockers ? the ultimate rigging biner and one which is super strong and super tough.It is large enough to accommodate several knots and has a very wide gate opening ? just what you need in a rigging situation. All of which makes it a great centre use biner, but the story doesn?t end there.Despite its name, the Big Boa is surprisingly light; by giving it an I-Beam construction we?ve reduced the overall weight by almost 25%. Add in the fact that it is easy to handle in gloves and the appeal to winter climbers is obvious.