Coghlan’s 6MM Biners are made with anodized aluminum and have spring-loaded closures. The Coghlan’s 6MM Biners are a great way to attach equipment, clothing, keys, tools and more, to your pack, canoe, tent or belt. Use them to organize your keys, hook a water bottle to your backpack for hands free carrying, or string up your campsite laundry line using a Coghlan’s 6MM Biner at either end for quick set up or dismantling. The Coghlan’s 6MM Biners can be used for any number of purposes, however they are Not strong enough to bear a persons body weight and are Not for climbing.