This is my favorite carabiner for clipping bolts due to the notchless and round nose. The uniform 10mm rod stock means this biner takes up less space in the hanger, as compared to a shaped ("T" cross-section) biner like the Petzl Spirit. Another benefit of the round cross section is less rope drag, especially noticeable when using these as your anchor/top-roping biners. The gate spring tension is just perfect for my tastes, which means slightly stronger than average. In my opinion the only drawback of this biner is its weight, which is about the same as a Petzl Spirit, or significantly more than the new "I-Beam" type biners out there. Again, on draws I prefer this biner for the bolt end, with a lighter weight biner on the rope end.

Works of art.