Made of high quality aluminum,used for daily life,not for professional climbing.The easiest and fastest way we know of to put work essentials, construction supplies and garden equipment in order and ready for storage, loading and carrying - so useful, you'll want several! ( not for climbing or supporting human weight)This Large carabiner can be used as a handle or hanger, with soft foam padded handle & extra large spring action gate loads easily and locks securely. Great for carrying bulky cords, cables and hoses coiled.