一种金属器材，通常钉在岩石上作为保护点，上面有洞可以连接钩环。
Bolt (n. ) metal secured into a drilled hole in the rock as means of protection. Often accompanied by a hanger, an eyelet to which a carabiner can attach.
分别是耳钩，T型针，连接环，珠配。
Ear hook, respectively, T-type needle, connecting rings, bead distribution.
弹簧钩，连接环，卸扣，华兰，卡头，秋千钩，圆环，S。
Snap hook, Quick link, Shackle, Tuenbuckle, Clip, Swing hook.
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