The patented key-lock design eliminates snagging when removing the carabiner from your harness, and a redesigned gate provides a full 2.1 inch (53 mm) opening Gate choices include the traditional Screw-Lock and the easy-to-open-with-one-hand Auto-Lock All of the XL carabiners have a removable keeper pin. Every carabiner is proof loaded. Serial numbers on every carabiner. Technical Specifications Auto-LockScrew-LockMajor Axis 40 kN40 kNMinor Axis 13 kN16 kNMajor Axis – Gate Open 11 kN11 kNWeight 289 g266 gGate Opening53 mm53 mmInterior Length168 mm168 mm Certifications NFPA G