Safety hook, also called "master lock", is the most commonly used connecting tool for connecting ropes, flat belts, anchor points and equipment. Safety shackle should be attached with locking function. Locking functions are divided into two categories: manual locking and automatic locking. Hand-turned lock is suitable for most environments, but it must be locked immediately after connection; otherwise, the door may be unlocked due to careless collision of equipment during operation, resulting in an accident. Unlocked shackle, just like the gate is open, its tensile force (breaking load) is much lower than that of locked shackle. There are two types: ordinary type (rotary type) and spring hook (self-locking type). The shapes are mostly "D" (rescue, military) and "8" (engineering, building).
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