One of our most popular carabiners, the Modified D is built from aircraft quality aluminum alloy. Internal locking threads eliminate rope wear and it's available in three different gate configurations: Screwgate, Quick Lok or 3-Stage Quik-Lok. UL Classified L. Meets NFPA 1983.01 edition construction requirements. Exceeds NFPA 1983.01 edition strength requirements Exceeds ANSI/OSHA strength requirements. Made in USA.