Carabiners,
small metal ovals with opening gates, are used extensively in rock
climbing and mountaineering as a connection between the rope/climber
and the protection attached to the rock wall/ice sheet. Engineering
advances in the last twenty years have enabled carabiners
to become far lighter, an advantage when weight is an issue and each
additional ounce is counted. With this new technology, however, comes
the question, how safe are these carabiners for climbing?