The cardinal shelf is composed of a backplate for dorsal palm and a bracket for wrist with a U-shaped rack fixed in front of it.

由掌背护板和腕托架构成主架，主架的前侧固定安装一U形前支架；

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Another ferrule that is used to enclose the wrist and antebrachium is linked to the crossbar of the U-shaped rack through elastic strings.

一用于腕臂套置的腕臂套圈通过弹力带连接在U形前支架的横杆上。

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