The Screw Lock Carabineer Clip is constructed from aircraft-quality 7000-series aluminum. This Carabineer is made with a Screw-Lok locking mechanism and a reinforced frame for greater strength. Unmatched 31kN strength rating - no other general purpose light aluminum carabineer comes close. All of the rope bearing surfaces on the Screw Lock Carabineer are true radii - no flat spots to wear out ropes prematurely. CE and UIAA certified. Made in USA. Note: Always read the instructions and warnings that accompany your equipment.