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The ProClimb Twist Lock I-Beamer Carabiner is a quintessential part of any fall protection system. It is better known for its larger gate opening, high-strength, and tapered keylock. This ANSI & NFPA version features your choice of twist-locking or triple-locking gate; providing excellent gate strength and security. Light-weight and strong, the I-Beamer Big D Carabiner is designed to help resist shearing forces and achieve high side-loading strength ratings.