ISC Mighty Big Mouse Super Save Aluminum Carabiner Auto Lock. From ISC of the UK. Slightly bigger version of the popluar Mighty Mouse carabiner. Tensile: 5824 lbs. Length: 4.75″ Width: 2.875″ Gate Opening: .875″ Lock Type: *Double Auto * requires two actions to prepare to open gate and gate will automatically lock upon release. **Alway double check lock and gate closure before using.**