The Omega Pacific X-Large D Screw-Lok Carabiner with Captive Eye is the same shape as 7/16 in. model, but with bigger material for increased strength. Same great handling and use characteristics but with a strength rating of 56kN. Like all Omega Pacific carabiners, every modified D carabiner is individually proof-tested to half it's rated strength which means every one of these has been proven to hold over 6000 lbs!