High strength aluminum alloy. GSA compliant. 5,500 pounds tested. 105mm. Black anodized finish. Our carabiners are widely used in sports requiring ropework, such as climbing, slacklining, caving ("Single Rope Technique"), canyoning, and sailing, and in industrial rope access work, such as construction or window cleaning. Black adonized D climbing carabiner. Size: 4.25" (inches).