Our Best Buddy D-Ring Carabiner with Lock is made of high quality aluminum alloy with a polished finish, ultra light yet strong, and tough enough to resist water and abrasion. Safety Lock: With D shape quick spring loaded gate design, screw can lock the carabiner to hold the bag, water bottle, key ring or other things and avoid falling off. Easy to Carry: 3-1/4 Inch D-Ring Carabiner Clips is compact, with palm sized design, which can be operated with one hand. Perfect for keyrings and wide range of outdoor activities.