3.5 inch heavy duty metal screw door carabiner with silver chrome D-rings, can be used for backpacks, hanging water bottles and key chains, securing tents and ropes, great for hiking, camping, fishing, travel and other outdoor activities. Carabiner with D-type quick spring door design, the screw can lock the carabiner to prevent bags, water bottles, key rings, etc. from falling. This locking carabiner is compact and convenient, easy to fasten, and can be used with one hand. Can be used as men's key chain carabiner. The carabiner is made of high-quality, lightweight, durable aluminum alloy and is rated at 120 lbs. Our carabiner keychains can be used to hang keys, backpacks, water bottles, toys and other everyday essentials. Perfect for outdoor activities such as hiking, fishing, camping, biking, traveling and more.