Grivel's Lamba HMS Twin Gate Carabiner is designed to provide the
security of a screwgate without the, well, screwgate. Instead, it offers
two gates that open on different axes and in different directions,
giving you the safety of "opposite and opposed" in one convenient
'biner. The Lambda's pear-shaped design makes it perfect for belaying
and good for building anchors, and it's slightly lighter than most
screwgates, too, if you're in the habit of counting ounces.