Karabiners (also known as Carabiners, Krabs, Crabs or 'Biners) are mainly used by climbers for attaching the rope to points of protection. Karabiners come in all shapes and sizes, from tiny lightweight wiregates for trad or alpine climbing to chunky quickdraws for sport climbing. Locking screwgate karabiners are used for extra security. HMS karabiners have a pear-shape which makes them ideal for belaying or clove-hitching multiple ropes to.