If durability & strength are more important to you than saving weight, then this is the perfect belaying/rigging biner. The Steel Boa may be 266g but it is also incredibly strong (a whopping 40k N Gate closed strength!), plus it has a zinc coating to protect against corrosion. The generous gate opening & large internal volume means it can accommodate multiple knots & is easy to handle in gloves. There is one final advantage too: it is made from smooth 12mm bar which allows easy rotation in attachment eyes.