Safety hook (carabiner), also called Master Lock, is divided into ordinary type (rotary) and spring hook (self-locking). The appearance is mostly like "D" (rescue, military) and "8" shape (engineering, architecture).

Spring-loaded at one end of the flap spring, ordinary type no spring. Cooperate with rope, Ascender, eight rings, bandlet, etc. In the field of fire protection, safety hook is mainly used to protect firefighters from falling during operation, and is also used for the hauling system. In the engineering field, the use of safety hook is mainly to protect the safety of high-level constructors. Safety rope the two ends are connected to safety hook, and the safety hook hook on one end is safety Belt on the upper semicircular ring, the safety hook at the other end is hooked to other fixed buildings (anchor points) after climbing. The parameters of safety hook are working tension (WS) and blasting tension (BS), according to different standards (such as NFPA1983) and manufacturers (such as KONG, Petzl, etc.), the parameters of its safety hook are also different.

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