High strength aluminum alloy. 105mm. GSA compliant. 5,500 pounds tested. Silver finish. Our carabiners are widely used in sports requiring rope work, such as climbing, slackening, caving ("Single Rope Technique"), canyoning, and sailing, and in industrial rope access work, such as construction or window cleaning. Silver D aluminum alloy climbing carabiner. Size: 4.25" (inches).Aluminum, Weight: 80g , Breaking Strength: 27kn , Strength Rating: 6 070 , Gate Opening: 16mm , Meets CE & UIAA Specifications